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Pupil

Which part of...

Question

Which part of eye controls the amount of light entering our eye? Iris or Pupil

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Solution

The iris regulates the amount of light entering the eye by adjusting the size of the pupil in the following way:

(i) If the intensity of the light is low, the iris makes the pupil expand to allow more light to enter the eye.
(ii) If the intensity of light is high, the iris makes the pupil contract in order to decrease the amount of light entering the eye.

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Similar questions

Q. The hole in the eye that controls the amount of light that enters is the
(a) iris.
(b) pupil.
(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.......

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