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WorksheetsLIght grade 8 revision
Total questions: 35
Worksheet time: 20mins
this problem arises due to foggy or cloudy lens .
presbyopia
myopia
cataract
hypermetropia
which colour bends the most on refraction through a triangular prism?
red
blue
green
violet
This phenomenon is responsible for rainbow formation.
refraction
dispersion
internal reflection
all of these
angle of deviation in a triangular prism is angle between
incident ray and refracted ray.
refracted ray and emergent ray.
extended incident and emergent ray
none of these
What do the lens and cornea have in common?
They both send messages to the brain.
They can both change shape.
They both contain photoreceptive cells.
They both bend light into a focused beam.
What would happen to your pupils if it's extremely bright outside?
They would let a lot of light into your eyes
They would expand and become very large
They would contract and become very small
They would close up completely
How are rods different from cones?
Rods are sensitive to light, while cones can detect color.
Cones are sensitive to light, while rods can detect color.
Cones send images to the brain, while rods do not.
Rods send images to the brain, while cones do not.
Which part of your eye is most like the film in a camera?
The iris
The retina
The pupil
The lens
Order the following: A) The optic nerve transmits signals; B) An image is projected onto the retina; C) Rods and cones transform an image into electrical impulses
B, A, C
C, A, B
A, C, B
B, C, A
What role does your brain play in the process of seeing?
It puts blurry images into focus.
It turns black-and-white images into color.
It flips upside-down images rightside-up.
It flips backwards images over so you see them the correct way.
Farsightedness occurs when light is focused ___________ the retina.
Infront of
Behind
Exactly on
When looking at far objects, the eyes _______.
Relax
Stretch
Contract
shrink
Which of these Diagrams represents NORMAL VISION ?
A
B
C
D
Which of these Diagrams represents NEAR SIGHTEDNESS ?
A
B
C
D
What is Braille?
night writing system
unique writing system for blinds
It's a language
language for deaf
Which part of the eye helps to focus the image?
Retina
Iris
Ciliary Muscle
Eye Lens
Which is NOT a color seen in the Color Spectrum?
Black
Indigo
Orange
Red
What is the persistence of vision.
1/16 of a second
1/14 of a second
1/15 of a second
1/19 of a second
Braille system has ____ dots patterns and characters
72
73
63
64
The comfortable distance at which a person can read is about ______
35m
35cm
25cm
25m
Lack of __________ in foodstuff is responsible for many eye troubles
Vitamin B complex
Vitamin D
Vitamin C
Vitamin A
A smooth shining surface, which rebounds the light back in same or in different direction, is called
Mirror
Incident ray
Lens
Idealisation
If the angle of incidence of light falling on a plane mirror is 30°, what will be the angle of reflection?
60°
30°
55°
40°
sunlight called white light consits of __________________
colours
1
5
0
7
The defect due to which a person is not able to see the distant objects clearly:
Myopia
Cataract
Hypermetropia
Cornea
A student sitting in the last bench in a classroom cannot see the letters written on the board clearly. But he can see the letters written in his book. Name the defect of vision
Myopia
Hypermetropia
Cataract
Astigmatism
A series of fast moving still pictures can create an illusion of movement. Why?
The eye can focus on very rapidly changing pictures
The eye is quicker than the brain
Persistence of vision
None of the above
Nocturnal animals will be having
Large Cornea
Large Pupil
Retina with large number of rods
All of the above
An interesting feature of a ____________ is that you will never see the same pattern again.
periscope
telescope
kaledioscope
mirror
What is the speed of light
300 m/s
300,000 m/s
300,000,000 m/s
300,000,000,000 m/s
the number of images formed by two mirrors kept at an angle with each other
360/ n - 1
380/n -1
310/n-1
none
