Question 4
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

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Solution

Correct Option: (c)
The change in focal length of an eye lens is caused by the action of ciliary muscles. Ciliary muscles contract and relax to adjust the focal length of the eyelens to see objects at different distances clearly.

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Similar questions

(a) Draw a labelled diagram of the human eye. Label the following parts on this diagram: Cornea, Iris, Pupil, Ciliary muscles, Eye-lens, Retina, Optic nerve and Blind spot.

(b) What are the functions of the following parts of the eye?

(i) Iris (ii) Eye-lens (iii) Ciliary muscles (iv) Retina (v) Optic nerve

Relaxation of the ciliary muscles causes the focal length of eye lens to:

What is the function of the following -

a - pupil

b- cornea

c- retina

d- iris

e - eye lids

d- optic nerve

d- siliary muscles

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Defects of Vision and Their Correction

Standard X Physics

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Question 4 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

Correct Option: (c) The change in focal length of an eye lens is caused by the action of ciliary muscles. Ciliary muscles contract and relax to adjust the focal length of the eyelens to see objects at different distances clearly.

Question 4
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

Correct Option: (c)
The change in focal length of an eye lens is caused by the action of ciliary muscles. Ciliary muscles contract and relax to adjust the focal length of the eyelens to see objects at different distances clearly.