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Human Eye & The Colourful World - 01
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Mr. Aseet Srivastava, (M.Sc., B.Ed.
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Q.1. The human eye forms the image of an object at its :
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cornea
retina
pupil
iris
Q.2. The change in focal length of an eye-lens is caused by the action of the :
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pupil
iris
ciliary muscles
retina
Other:
Q.3. The least distance of distinct vision for a young adult with normal vision is about :
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2.5 m
2.5 cm
25 cm
25 m
Q.4. Refraction of light in the eye occurs at :
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the pupil
the cornea only
both the cornea and the lens
the lens only
Q.5. To focus the image of a nearby object on the retina of an eye :
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the thickness of eye-lens is increased
the distance between eye-lens and retina is increased
the distance between eye-lens and retina is decreased
the thickness of eye-lens is decreased
Q.6. The term “accommodation” as applied to the eye, refers to its ability to :
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erect the inverted image formed on the retina
vary the distance between the lens and retina
control the light intensity falling on the retina
vary the focal length of the lens
Q.7. Which of the following controls the amount of light entering the eye ?
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iris
cornea
lens
ciliary muscles
Q.8. The human eye possesses the power of accommodation. This is the power to :
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alter the diameter of the pupil as the intensity of light changes
decide which of the two objects is closer.
distinguish between lights of different colours
focus on objects at different distances
Q.9. How does the eye change in order to focus on near or distant objects ?
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The lens becomes thicker or thinner
The pupil gets larger or smaller
The lens moves in or out
The retina moves in or out
Q.10. Which of the following changes occur when you walk out of bright sunshine into a poorly lit room ?
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the lens becomes thicker
the ciliary muscle relaxes
the pupil becomes smaller
the pupil becomes larger
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