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Pupil

Name the part...

Question

Name the part of the eye:
(a) which controls the amount of light entering the eye.
(b) on which the image is formed.
(c) which changes the focal length of eye-lens.

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Solution

(a) The iris is the part of the eye that controls the amount of light entering the eye.
(b) The retina is the part of the eye on which images are formed.
(c) The ciliary muscles change the focal length of the eye lens.

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Similar questions

Q. Draw a labelled diagram of the eye and answer the following questions:
(a) From where does light enter the eye?
(b) Which muscles control the focal length of the eye lens?
(c) Where is the image formed?
(d) Which nerve sends the image signals to the brain?

Q. Which part of the eye controls the amount of light entering in it?

Question 1

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

Q. If a person has a disability to control the amount of light entering the eye, which part of the eye is defective?

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.......

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