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

(c) ciliary muscles

The ciliary muscles change the focal length of the eye lens by changing its shape.

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

(a) pupil

(b) retina

(d) iris

(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

Q. The ciliary muscles in an eye change the focal length of an eye lens to focus distant or nearby objects clearly, this ability of an eye is known as the power of an eye.

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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

(c) ciliary muscles The ciliary muscles change the focal length of the eye lens by changing its shape.

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

(c) ciliary muscles

The ciliary muscles change the focal length of the eye lens by changing its shape.