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Defects of Vision and Their Correction

When a person...

Question

When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because.

A

The eye muscles cannot immediately change the focal length of the eye lens

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B

The retina retains the bright images for some time and becomes momentarily insensitive

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C

The iris is unable to contract the pupil immediately

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D

The iris is unable to dilate the pupil immediately

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Solution

The correct option is
D

The iris is unable to dilate the pupil immediately

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Similar questions

Q. (a) Explain the functions of the following parts of the eye :
(a) cornea (b) iris (c) pupil (d) ciliary muscles (e) eye-lens
(f) retina (g) optic nerve
(b) If you walk from a dark room into sunlight and back again into dark room, how would your pupils after in size ? What makes this happen ?
(c) Explain why, we cannot see our seats first when we enter a darkened cinema hall from bright light but gradually they become visible.

The change in focal length of an eye lens is caused by the action of the

(a) pupil

(b) retina

(c) ciliary muscles

(d) iris

Q. Assertion :Circular smooth muscles of iris contract when bright light falls on the eye. Reason: Pupil gets constricted by the contraction circular smooth muscles of iris.

Q. A normal eye is not able to see objects closer than 25 cm because
(a) the focal length of the eye is 25 cm
(b) the distance of the retina from the eye-lens is 25 cm
(c) the eye is not able to decrease the distance between the eye-lens and the retina beyond a limit
(d) the eye is not able to decrease the focal length beyond a limit.

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

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Defects of Vision and Their Correction

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