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Retina

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Question 1

Part of the eye which controls the entering of light is called
(a) iris
(b) cornea
(c) lens
(d) retina

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Solution

Iris is a dark muscular structure behind the cornea, which controls the amount of light entering into the eye. It controls the size of the pupil, thereby controlling the amount of light entering the eye.

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Question 1

Part of the eye which controls the entering of light is called
(a) iris
(b) cornea
(c) lens
(d) retina

Q. The white part of eye is called
(a) pupil
(b) iris
(c) cornea
(d) sclera

Q. Fill in the following blanks with suitable words:
(a) Most of the refraction of light rays entering the eye occurs at the outer surface of the.............
(b) The part of eye sensitive to light is...................
(c) The part of eye which alters the size of the pupil is............
(d) When light is dim, the pupil becomes................
(e) The iris controls the amount of................entering the eye.
(f) The ciliary muscles control the shape of the ...............
(g) To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made..........
(h) To bring light from a near object to a focus on the retina of the eye, the convex eye-lens need to be made.......

Q. What are the functions of the cornea, iris, pupil, eye lens and retina?

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