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HUMAN EYE & COLOURFUL WORLD

Total questions: 62

Worksheet time: 40mins

Name
Class
Date
1.

When white light passes through a prism,

a)

red bends more, violet bends least

b)

red bends least, violet bends most

c)

dispersion doesn't occur

d)

refraction doesn't occur

2.

The splitting of white light into the seven colors when it passes through a transparent material is called

a)

Refractrion

b)

Dispersion

c)

Reflection

d)

Diffraction

3.

A ray of white light enters the raindrop and undergoes __________ and __________ to form a spectrum.

a)

refraction; dispersion

b)

reflection; dispersion

c)

dispersion; diffraction

d)

scattering; dispersion

4.

The refraction of light passed by the Earth’s Atmosphere having air layers of varying __________ is called atmospheric refraction.

a)

optical densities

b)

densities

c)

volumes of air

d)

winds

5.

Red light has

a)

longer wavelength

b)

shorter wavelength

c)

longer frequency

d)

none of the above

6.

When white light enters a prism, it gets split into its constituent colours. This is due to

a)

different refractive index for different wavelength of each colour

b)

each colours has same velocity in the prism.

c)

prism material have high density.

d)

Scattering of light

7.

The air layer of atmosphere whose temperature is less then the hot layer behave as optically

a)

denser medium

b)

rarer medium

c)

inactive medium

d)

either denser or rarer medium

8.

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

a)

moves fastest in air

b)

is absorbed the most by smoke or fog

c)

is scattered the least by smoke or fog

d)

is scattered the most by smoke or fog

9.
What is happening in this picture?
a)
The water is making the pencil bigger
b)
the water is refracting (bending) the pencil
c)
the water is refracting (bending) the light to make the pencil look bent
d)
light is being absorbed
10.

The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

a)

scattering

b)

interference

c)

tyndell effect

d)

Reflection

11.

At noon the sun appears white as [NCERT Exemplar Problems]

a)

light is least scattered

b)

all the colours of the white light are scattered away

c)

blue colour is scattered the most

d)

red colour is scattered the most

12.

Scattering of light by colloidal solution is known as

a)

Scattering

b)

Dispersion

c)

Tyndall effect

d)

Stability

13.

The colored light that refracts most while passing through a prism is

a)

Red

b)

Yellow

c)

Blue

d)

Violet

14.

Refraction of light by the earth’s atmosphere due to variation in air density is called

a)

atmospheric reflection

b)

atmospheric dispersion

c)

atmospheric scattering

d)

atmospheric refraction

15.

One cannot see through the fog, because

a)

refractive index of the fog is very high

b)

fog absorbs light

c)

light is scattered by the droplets

d)

light suffers total reflection at droplets

16.

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

a)

Dispersion of light

b)

Scattering of light

c)

Total internal reflection of light

d)

Reflection of light from the earth

View Answer

17.

Assertion: Planets do not twinkle

Reason: Light rays do not come from planet

a)

Assertion and reason are true. Reason is the correct explanation of Assertion

b)

Assertion and reason are false

c)

Assertion is false, but reason is true

d)

Assertion is true, but reason is false

18.

∠D\angle D  is called as

a)

Angle of incidence

b)

Angle of deviation

c)

Angle of dispersion

d)

Angle of refraction

19.

Assertion(A) : The phenomenon of scattering of light by the colloidal particles gives rise to Tyndall effect.

Reason (R): The colour of the scattered light depends on the size of the scattering particles.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false.

d)

A is false but R is true.

20.

Assertion(A) : A rainbow is sometimes seen in the sky in rainy season only when observer’s back is towards the Sun.

Reason (R) : Internal reflection in the water droplets cause dispersion and the final rays are in backward direction.

a)

Both A and R are true and R is the correct explanation of A.

b)

Both A and R are true but R is not the correct explanation of A.

c)

A is true but R is false.

d)

A is false but R is true.

21.

A ray of white light enters the raindrop and undergoes __________ and __________ to form a spectrum.

a)

refraction; dispersion

b)

reflection; dispersion

c)

dispersion; diffraction

d)

scattering; dispersion

22.

The muscular diaphragm that controls the size of the pupil is

a)

cornea

b)

ciliary muscles

c)

iris

d)

retina

23.

Having two eyes facilitates in

A : Increasing the field of view

B : Bringing three-dimensional view

C : Developing the concept of distance/ size

Then the correct option is/are

a)

A only

b)

A and B only

c)

B only

d)

A, B and C

24.

Near and far points of a young person normal eye respectively are

a)

0 and infinity

b)

0 and 25 cm

c)

25 cm and infinity

d)

25 cm and 150 cm.

25.

The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called

a)

Long-sightedness

b)

Far-sightedness

c)

Hypermetropia

d)

All above

26.

The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called

a)

Power of observation of the eye

b)

Power of adjustment of the eye

c)

Power of accommodation of the eye

d)

Power of enabling of the eye

27.

The image formed by retina of human eye is

a)

Real and inverted

b)

Virtual and inverted

c)

Virtual and erect

d)

Real and erect

28.

When white light enters a prism, it gets split into its constituent colours. This is due to

a)

different refractive index for different wavelength of each colour

b)

each colours has same velocity in the prism.

c)

prism material have high density.

d)

Scattering of light

29.

Bi-focal lens are required to correct

a)

presbyopia

b)

astigmatism

c)

coma

d)

myopia

30.

What is myopia and how does it affect vision?

a)

Myopia has no effect on vision and is just a cosmetic issue.

b)

Myopia is a condition where both close and distant objects appear blurred, making it difficult to see anything clearly.

c)

Myopia is a condition where distant objects can be seen clearly, but close objects appear blurred. It is also known as farsightedness.

d)

Myopia is a condition where close objects can be seen clearly, but distant objects appear blurred. It is also known as nearsightedness.

31.

Explain the condition of hyperopia and its impact on vision.

a)

Hyperopia causes difficulty in seeing distant objects clearly.

b)

Hyperopia causes color blindness.

c)

Hyperopia causes difficulty in seeing close objects clearly.

d)

Hyperopia causes no impact on vision.

32.

What is astigmatism and how does it affect vision?

a)

Astigmatism causes color blindness

b)

Astigmatism causes blurred or distorted vision.

c)

Astigmatism has no effect on vision

d)

Astigmatism causes improved vision

33.

The band of coloured components of a light beam is called _______ .

a)

Spectrum

b)

Dispersion

c)

White light

d)

Reflected light

34.

Rainbow formation is the combined phenomena of ____ ____ .

a)

Reflection and dispersion

b)

Refraction, dispersion and internal reflection

c)

Refraction and internal reflection

d)

Dispersion and internal reflection

35.

The sun is visible to us ___ minutes, ______ the actual sunrise.

a)

1 minute, after

b)

1 minute, before

c)

2 minutes, after

d)

2 minutes, before

36.

Which of the following is the best example of white light?

a)

Danger signals

b)

laser light

c)

sun light

d)

sodium lamp

37.

myopia is an inability of an eye in viewing

a)

long distance objects

b)

short distance objects

c)

both a and b

38.

short sightedness is due to

a)

excess curvature of cornea

b)

elongation of eye ball

c)

both a and b

39.

bifocal lens are used to correct

a)

presbiopic eye

b)

myopic eye

c)

hypermetropic eye

40.

near point and far point of human eyes are

a)

25cm, infinity

b)

infinity , 25cm

c)

25cm, 0 cm

41.

in hypermetropia, the image is formed

a)

in front of retina

b)

on retina

c)

behind the retina

42.

Name this eye Defect

a)

Hypermetropia

b)

Myopia

c)

Presbyopia

d)

Astigmatsim

43.

The white light is composed of _______ colours

a)

1

b)

3

c)

7

d)

8

44.

the minimum distance from real object to a real image in a concave mirror

a)

2f

b)

f

c)

0

d)

f/2

45.

Far point of person is 5 cm in order that he has normal vision what kind of spectales should he use

a)

concave lens with focal length 5m

b)

concave lens with focal length 10m

c)

convex lens with focal length 5m

d)

concave lens with focal length 2.5m

46.

the focal length of normal eye lens is

a)

2 cm

b)

25 cm

c)

1m

d)

25 m

47.

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power

a)

+ 0.5 D

b)

- 0.5 D

c)

+ 0.2 D

d)

- 0.2 D

48.

A person having a myopic eye used the concave lens of focal length of 50 cm. Calculate the power of a lens.

a)

+2 D

b)

+0.2 D

c)

-0.2 D

d)

-2 D

49.

The far point of a myopic person is 40 cm in front of the eye. What is the nature of the lens and power of the lens required to correct the problem?

a)

P = +2.5 D

Convex lens

b)

P = - 2.5 D

Concave lens

c)

P = + 0.4 D

Convex lens

d)

P = - 0.4 D

Concave lens

50.

The near point of a hypermetropic eye is 50cm. What is the power of a lens is required to correct this defect. Assuming that the near point of the normal human eye is 25 cm.

a)

P = 2D

Concave lens

b)

P = 0.2 D

Convex lens

c)

P = 2 D

Convex lens

d)

P = 0.2 D

Concave lens

51.

which eye defect does the given image represent

a)

myopia

b)

hypermetropia

c)

presbyopia

d)

all the above

52.

which vision defect does the given figure represent

a)

myopia

b)

hypermetropia

c)

presbyopia

d)

none of the above

53.

The power of accommodation for the normal human eye is....

a)

400 D

b)

40 D

c)

-40 D

d)

-400 D

54.

Eye lens is adjust its focal length to a minimum value of ----

a)

25 cm

b)

2.5 cm

c)

2.27 cm

d)

60 cm

55.

The value of angle of vision of a healthy person is

a)

90 0

b)

180 0

c)

60 0

d)

30 0

56.

The degree of convergence or divergence of light rays that can be achieveed by a lens is called ---- of the lens.

a)

power of accommodation

b)

power

c)

myopia

d)

presbyopia

57.

What is the focal length of the lens and type of lens, if the power of the lens is -4 D,

a)

25 cm, convex

b)

25 cm, concave

c)

40 cm, convex

d)

40 cm, concave

58.

Units of power of lens is

a)

watts

b)

joules

c)

diopters

d)

degree

59.

If the distance of far point of is D, then the required focal length of the lens is

a)

f = -D

b)

f = 25DD−25f\ =\ \frac{25D}{D-25}

c)

f = +D

d)

f = (25 −D)25Df\ =\ \frac{\left(25\ -D\right)}{25D}

60.

If the distance of near point of is d, then the required focal length of the lens is

a)

f = -d

b)

f = (25 − d)25df\ =\ \frac{\left(25\ -\ d\right)}{25d}

c)

f= +d

d)

f = 25dd−25f\ =\ \frac{25d}{d-25}

61.

Far point of person is 5 m, in order that he has normal vision what kind of spectales should he use

a)

concave lens with focal length 5m

b)

concave lens with focal length 10m

c)

convex lens with focal length 5m

d)

convex lens with focal length 10 m

62.

Why does the sun appear white at noon?

a)

Because all the colors of white light are scattered away

b)

Because red color is scattered the most

c)

Because blue color is scattered the most

d)

Because light is least scattered

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