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WorksheetsHuman Eye and Control_4
Total questions: 55
Worksheet time: 28mins
Refraction of light by the earth’s atmosphere due to variation in air density is called
atmospheric reflection
atmospheric dispersion
atmospheric scattering
atmospheric refraction
Twinkling of Stars: What is the first statement of the audio clip?
The light of star when enters Earth’s atmosphere undergoes refraction, the light bends towards the normal as light travels from rarer to denser medium so the position of star spotted in sky is different from its actual position
Star is a point sized source of light and the amount of light entering air changes
Sometimes it appears brighter and at some time hazier as the light travels from far distant and the atmosphere is not same always.
Sun is visible 2 minutes before actual sunrise and about 2 minutes after the actual sunset because of atmospheric refraction.
Twinkling of Stars: What is the second statement of the audio clip?
The light of star when enters Earth’s atmosphere undergoes refraction, the light bends towards the normal as light travels from rarer to denser medium so the position of star spotted in sky is different from its actual position
Star is a point sized source of light and the amount of light entering air changes
Sometimes it appears brighter and at some time hazier as the light travels from far distant and the atmosphere is not same always.
Sun is visible 2 minutes before actual sunrise and about 2 minutes after the actual sunset because of atmospheric refraction.
Twinkling of Stars: What is the Third statement of the audio clip?
The light of star when enters Earth’s atmosphere undergoes refraction, the light bends towards the normal as light travels from rarer to denser medium so the position of star spotted in sky is different from its actual position
Star is a point sized source of light and the amount of light entering air changes
Sometimes it appears brighter and at some time hazier as the light travels from far distant and the atmosphere is not same always.
Sun is visible 2 minutes before actual sunrise and about 2 minutes after the actual sunset because of atmospheric refraction.
Twinkling of Stars: What is the Fourth statement of the audio clip?
The light of star when enters Earth’s atmosphere undergoes refraction, the light bends towards the normal as light travels from rarer to denser medium so the position of star spotted in sky is different from its actual position
Star is a point sized source of light and the amount of light entering air changes
Sometimes it appears brighter and at some time hazier as the light travels from far distant and the atmosphere is not same always.
Sun is visible 2 minutes before actual sunrise and about 2 minutes after the actual sunset because of atmospheric refraction.
Tyndall Effect - Why does the sky appear blue? What is the first statement of the video clip?
Topic: Tyndall Effect. Why does the sky appear blue?
It is such a beautiful rainbow. Have you ever wondered how it is formed?
A rainbow is formed when raindrops split sunlight into different colors.
Sunlight or white light consists of many colors.
However, only a few of them are visible to us.
Tyndall Effect - Why does the sky appear blue? What is the Second statement of the video clip?
A band of these visible colors is called a visible spectrum.
It is such a beautiful rainbow. Have you ever wondered how it is formed?
A rainbow is formed when raindrops split sunlight into different colors.
Sunlight or white light consists of many colors.
However, only a few of them are visible to us.
Tyndall Effect - Why does the sky appear blue? What is the Third statement of the video clip?
A band of these visible colors is called a visible spectrum.
When we see a rainbow, our brain and eyes distinguish the visible spectrum into seven main colors.
A rainbow is formed when raindrops split sunlight into different colors.
Sunlight or white light consists of many colors.
However, only a few of them are visible to us.
Tyndall Effect - Why does the sky appear blue? What is the Fourth statement of the video clip?
A band of these visible colors is called a visible spectrum.
When we see a rainbow, our brain and eyes distinguish the visible spectrum into seven main colors.
Namely red, orange, yellow, green, blue, indigo and violet.
Sunlight or white light consists of many colors.
However, only a few of them are visible to us.
Tyndall Effect - Why does the sky appear blue? What is the Fifth statement of the video clip?
A band of these visible colors is called a visible spectrum.
When we see a rainbow, our brain and eyes distinguish the visible spectrum into seven main colors.
Namely red, orange, yellow, green, blue, indigo and violet.
Did you notice that the size of the balls increased?
However, only a few of them are visible to us.
Tyndall Effect - Why does the sky appear blue? What is the Sixth statement of the video clip?
A band of these visible colors is called a visible spectrum.
When we see a rainbow, our brain and eyes distinguish the visible spectrum into seven main colors.
Namely red, orange, yellow, green, blue, indigo and violet.
Did you notice that the size of the balls increased?
Yes, you guessed right.
Tyndall Effect - Why does the sky appear blue? What is the Seventh statement of the video clip?
The balls represent the different colors of a rainbow in increasing order of their wavelengths.
When we see a rainbow, our brain and eyes distinguish the visible spectrum into seven main colors.
Namely red, orange, yellow, green, blue, indigo and violet.
Did you notice that the size of the balls increased?
Yes, you guessed right.
Tyndall Effect - Why does the sky appear blue? What is the Eighth statement of the video clip?
The balls represent the different colors of a rainbow in increasing order of their wavelengths.
Wavelength is the distance between consecutive crests or consecutive troughs in a wave.
Namely red, orange, yellow, green, blue, indigo and violet.
Did you notice that the size of the balls increased?
Yes, you guessed right.
Tyndall Effect - Why does the sky appear blue? What is the Ninth statement of the video clip?
The balls represent the different colors of a rainbow in increasing order of their wavelengths.
Wavelength is the distance between consecutive crests or consecutive troughs in a wave.
In a rainbow, as we move from violet to red, the wavelength of colors increases.
Did you notice that the size of the balls increased?
Yes, you guessed right.
Tyndall Effect - Why does the sky appear blue? What is the Tenth statement of the video clip?
The balls represent the different colors of a rainbow in increasing order of their wavelengths.
Wavelength is the distance between consecutive crests or consecutive troughs in a wave.
In a rainbow, as we move from violet to red, the wavelength of colors increases.
Violet has the shortest wavelength while red has the longest wavelength.
Yes, you guessed right.
Tyndall Effect - Why does the sky appear blue? What is the Eleventh statement of the video clip?
The balls represent the different colors of a rainbow in increasing order of their wavelengths.
Wavelength is the distance between consecutive crests or consecutive troughs in a wave.
In a rainbow, as we move from violet to red, the wavelength of colors increases.
Violet has the shortest wavelength while red has the longest wavelength.
Do you think that our eyes have a natural inclination towards blue as compared to violet?
Tyndall Effect - Why does the sky appear blue? What is the Twelfth statement of the video clip?
Yes, this is one of the reasons why our sky appears blue and not violet. 20 00:03:47,010 --> 00:03:51,440 To understand this, first let us study about Tyndall effect.
Wavelength is the distance between consecutive crests or consecutive troughs in a wave.
In a rainbow, as we move from violet to red, the wavelength of colors increases.
Violet has the shortest wavelength while red has the longest wavelength.
Do you think that our eyes have a natural inclination towards blue as compared to violet?
Tyndall Effect - Why does the sky appear blue? What is the Thirteenth statement of the video clip?
Yes, this is one of the reasons why our sky appears blue and not violet. 20 00:03:47,010 --> 00:03:51,440 To understand this, first let us study about Tyndall effect.
Tyndall effect is a phenomenon.
In a rainbow, as we move from violet to red, the wavelength of colors increases.
Violet has the shortest wavelength while red has the longest wavelength.
Do you think that our eyes have a natural inclination towards blue as compared to violet?
Tyndall Effect - Why does the sky appear blue? What is the Fourteenth statement of the video clip?
Yes, this is one of the reasons why our sky appears blue and not violet. 20 00:03:47,010 --> 00:03:51,440 To understand this, first let us study about Tyndall effect.
Tyndall effect is a phenomenon.
In which a beam of light scatters on striking the particles present in its path.
Violet has the shortest wavelength while red has the longest wavelength.
Do you think that our eyes have a natural inclination towards blue as compared to violet?
Tyndall Effect - Why does the sky appear blue? What is the Fifteenth statement of the video clip?
Yes, this is one of the reasons why our sky appears blue and not violet. 20 00:03:47,010 --> 00:03:51,440 To understand this, first let us study about Tyndall effect.
Tyndall effect is a phenomenon.
In which a beam of light scatters on striking the particles present in its path.
This scattering of light is responsible for the blue color of the sky.
Do you think that our eyes have a natural inclination towards blue as compared to violet?
Tyndall Effect - Why does the sky appear blue? What is the Sixteenth statement of the video clip?
Yes, this is one of the reasons why our sky appears blue and not violet. 20 00:03:47,010 --> 00:03:51,440 To understand this, first let us study about Tyndall effect.
Tyndall effect is a phenomenon.
In which a beam of light scatters on striking the particles present in its path.
This scattering of light is responsible for the blue color of the sky.
We know that our atmosphere primarily consists of oxygen and nitrogen particles.
Tyndall Effect - Why does the sky appear blue? What is the Seventeenth statement of the video clip?
Along with dust, smoke and other particles in comparatively smaller proportions.
Tyndall effect is a phenomenon.
In which a beam of light scatters on striking the particles present in its path.
This scattering of light is responsible for the blue color of the sky.
We know that our atmosphere primarily consists of oxygen and nitrogen particles.
Tyndall Effect - Why does the sky appear blue? What is the Eighteenth statement of the video clip?
Along with dust, smoke and other particles in comparatively smaller proportions.
The size of these particles in the atmosphere is responsible for the color of scattered light.
In which a beam of light scatters on striking the particles present in its path.
This scattering of light is responsible for the blue color of the sky.
We know that our atmosphere primarily consists of oxygen and nitrogen particles.
Tyndall Effect - Why does the sky appear blue? What is the Nineteenth statement of the video clip?
Along with dust, smoke and other particles in comparatively smaller proportions.
The size of these particles in the atmosphere is responsible for the color of scattered light.
When the sunlight strikes particles of dust, smoke, etc.
This scattering of light is responsible for the blue color of the sky.
We know that our atmosphere primarily consists of oxygen and nitrogen particles.
Tyndall Effect - Why does the sky appear blue? What is the Twentieth statement of the video clip?
Along with dust, smoke and other particles in comparatively smaller proportions.
The size of these particles in the atmosphere is responsible for the color of scattered light.
When the sunlight strikes particles of dust, smoke, etc.
Which are bigger than the wavelength of sunlight, all the colors of sunlight are equally scattered.
We know that our atmosphere primarily consists of oxygen and nitrogen particles.
Tyndall Effect - Why does the sky appear blue? What is the Twenty-First statement of the video clip?
Along with dust, smoke and other particles in comparatively smaller proportions.
The size of these particles in the atmosphere is responsible for the color of scattered light.
When the sunlight strikes particles of dust, smoke, etc.
Which are bigger than the wavelength of sunlight, all the colors of sunlight are equally scattered.
As a result, the scattered light appears white.
Tyndall Effect - Why does the sky appear blue? What is the Twenty-Second statement of the video clip?
However, when the sunlight strikes particles of oxygen and nitrogen.
The size of these particles in the atmosphere is responsible for the color of scattered light.
When the sunlight strikes particles of dust, smoke, etc.
Which are bigger than the wavelength of sunlight, all the colors of sunlight are equally scattered.
As a result, the scattered light appears white.
Tyndall Effect - Why does the sky appear blue? What is the Twenty-Third statement of the video clip?
However, when the sunlight strikes particles of oxygen and nitrogen.
Which are smaller than the wavelength of sunlight, the colors of sunlight having shorter wavelengths.
When the sunlight strikes particles of dust, smoke, etc.
Which are bigger than the wavelength of sunlight, all the colors of sunlight are equally scattered.
As a result, the scattered light appears white.
Tyndall Effect - Why does the sky appear blue? What is the Twenty-Fourth statement of the video clip?
However, when the sunlight strikes particles of oxygen and nitrogen.
Which are smaller than the wavelength of sunlight, the colors of sunlight having shorter wavelengths.
Blue and violet are much more scattered than colors having longer wavelengths.
Which are bigger than the wavelength of sunlight, all the colors of sunlight are equally scattered.
As a result, the scattered light appears white.
Tyndall Effect - Why does the sky appear blue? What is the Twenty-Fifth statement of the video clip?
However, when the sunlight strikes particles of oxygen and nitrogen.
Which are smaller than the wavelength of sunlight, the colors of sunlight having shorter wavelengths.
Blue and violet are much more scattered than colors having longer wavelengths.
But our eyes are much more sensitive to blue color as compared to violet, hence the sky appears blue to us.
As a result, the scattered light appears white.
Tyndall Effect - Why does the sky appear blue? What is the Twenty-Sixth statement of the video clip?
However, when the sunlight strikes particles of oxygen and nitrogen.
Which are smaller than the wavelength of sunlight, the colors of sunlight having shorter wavelengths.
Blue and violet are much more scattered than colors having longer wavelengths.
But our eyes are much more sensitive to blue color as compared to violet, hence the sky appears blue to us.
As a result, the scattered light appears white.
Tyndall Effect - Why does the sky appear blue? What is the Twenty-Seventh statement of the video clip?
However, when the sunlight strikes particles of oxygen and nitrogen.
Which are smaller than the wavelength of sunlight, the colors of sunlight having shorter wavelengths.
Blue and violet are much more scattered than colors having longer wavelengths.
But our eyes are much more sensitive to blue color as compared to violet, hence the sky appears blue to us.
As a result, the scattered light appears white.
Tyndall Effect - Why does the sky appear blue? What is the Twenty-Eighth statement of the video clip?
However, when the sunlight strikes particles of oxygen and nitrogen.
Which are smaller than the wavelength of sunlight, the colors of sunlight having shorter wavelengths.
Blue and violet are much more scattered than colors having longer wavelengths.
But our eyes are much more sensitive to blue color as compared to violet, hence the sky appears blue to us.
As a result, the scattered light appears white.
Tyndall Effect - Why does the sky appear blue? What is the Twenty-Ninth statement of the video clip?
However, when the sunlight strikes particles of oxygen and nitrogen.
Which are smaller than the wavelength of sunlight, the colors of sunlight having shorter wavelengths.
Blue and violet are much more scattered than colors having longer wavelengths.
But our eyes are much more sensitive to blue color as compared to violet, hence the sky appears blue to us.
As a result, the scattered light appears white.
Why are sunsets red? What is the first statement of the video clip?
Hi friends I'm at the southernmost point in India at Kanyakumari and here we are watching the beautiful sunset
Now can you tell me why does the Sun appear red at sunset
We know that the Sun gives white light because it appears white at noon but why does the Sun appear red during sunset
Let me give you some options is it due to reflection of light, refraction of light, dispersion of light or scattering of light
That's right the correct answer is it's due to the scattering of light. Now let's take a look why
Why are sunsets red? What is the Second statement of the video clip?
When we are looking at the sunset, the Sun is really close to the horizon
Now can you tell me why does the Sun appear red at sunset
We know that the Sun gives white light because it appears white at noon but why does the Sun appear red during sunset
Let me give you some options is it due to reflection of light, refraction of light, dispersion of light or scattering of light
That's right the correct answer is it's due to the scattering of light. Now let's take a look why
Why are sunsets red? What is the Third statement of the video clip?
When we are looking at the sunset, the Sun is really close to the horizon
So the sunlight is traveling through a large distance in the Earth's atmosphere
We know that the Sun gives white light because it appears white at noon but why does the Sun appear red during sunset
Let me give you some options is it due to reflection of light, refraction of light, dispersion of light or scattering of light
That's right the correct answer is it's due to the scattering of light. Now let's take a look why
Why are sunsets red? What is the Fourth statement of the video clip?
When we are looking at the sunset, the Sun is really close to the horizon
So the sunlight is traveling through a large distance in the Earth's atmosphere
And as you know, red light is scattered the least blue and green light they get scattered more
Let me give you some options is it due to reflection of light, refraction of light, dispersion of light or scattering of light
That's right the correct answer is it's due to the scattering of light. Now let's take a look why
Why are sunsets red? What is the Fifth statement of the video clip?
When we are looking at the sunset, the Sun is really close to the horizon
So the sunlight is traveling through a large distance in the Earth's atmosphere
And as you know, red light is scattered the least blue and green light they get scattered more
But red light due to its large wavelength is scattered the least and it reaches our eyes and
That's right the correct answer is it's due to the scattering of light. Now let's take a look why
Why are sunsets red? What is the Sixth statement of the video clip?
When we are looking at the sunset, the Sun is really close to the horizon
So the sunlight is traveling through a large distance in the Earth's atmosphere
And as you know, red light is scattered the least blue and green light they get scattered more
But red light due to its large wavelength is scattered the least and it reaches our eyes and
That's why the Sun appears red during sunset
Why are sunsets red? What is the Seventh statement of the video clip?
When we are looking at the sunset, the Sun is really close to the horizon
So the sunlight is traveling through a large distance in the Earth's atmosphere
And as you know, red light is scattered the least blue and green light they get scattered more
But red light due to its large wavelength is scattered the least and it reaches our eyes and
That's why the Sun appears red during sunset
Why are sunsets red? What is the Eighth statement of the video clip?
When we are looking at the sunset, the Sun is really close to the horizon
So the sunlight is traveling through a large distance in the Earth's atmosphere
And as you know, red light is scattered the least blue and green light they get scattered more
But red light due to its large wavelength is scattered the least and it reaches our eyes and
That's why the Sun appears red during sunset
Why are sunsets red? What is the Ninth statement of the video clip?
When we are looking at the sunset, the Sun is really close to the horizon
So the sunlight is traveling through a large distance in the Earth's atmosphere
And as you know, red light is scattered the least blue and green light they get scattered more
But red light due to its large wavelength is scattered the least and it reaches our eyes and
That's why the Sun appears red during sunset
Why are sunsets red? What is the Tenth statement of the video clip?
When we are looking at the sunset, the Sun is really close to the horizon
So the sunlight is traveling through a large distance in the Earth's atmosphere
And as you know, red light is scattered the least blue and green light they get scattered more
But red light due to its large wavelength is scattered the least and it reaches our eyes and
That's why the Sun appears red during sunset
When there is no atmosphere (space) or no light (night), the scattering does not take place
Sky appears blue
Sky appears black
A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of corrective lens used to restore proper vision?
concave lens
convex lens
For normal vision, the far point is at ............ distance.
25 cm
1 m
1 m
Infinite
For normal vision, the near point is at ............ distance.
25 cm
1 m
1 m
Infinite
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected? What is the first statement of the audio clip?
A student is suffering with the eye defect named myopia
a, in this defect person can see nearby objects clearly but cannot see far off objects distinctly
It can be corrected by using concave lens
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected? What is the Second statement of the audio clip?
A student is suffering with the eye defect named myopia
a, in this defect person can see nearby objects clearly but cannot see far off objects distinctly
It can be corrected by using concave lens
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected? What is the Third statement of the audio clip?
A student is suffering with the eye defect named myopia
a, in this defect person can see nearby objects clearly but cannot see far off objects distinctly
It can be corrected by using concave lens
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
(a) presbyopia
(b) accommodation
(c) near-sightedness
(d) far-sightedness
The human eye forms the image of an object at its
(a) cornea.
(b) iris.
(c) pupil.
(d) retina
The least distance of distinct vision for a young adult with normal vision is about
(a) 25 m.
(b) 2.5 cm.
(c) 25 cm.
(d) 2.5 m.
The change in focal length of an eye lens is caused by the action of the
(a) pupil.
(b) retina.
(c) ciliary muscles.
(d) iris.
