Question

The change in converging power of an eye-lens is caused by the action of:
A. iris
B. ciliary muscles
C. optic nerve
D. retina

Answer 1

Answer:

(B) ciliary muscles.

Explanation:

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Answer 2

The change in converging power of an eye-lens is caused by B. ciliary muscles

Explanation:

• We can clearly view an object only when image is clearly reflected on retina.
• Our eyes focus distinct and near objects and reflects the image on retina.
• When eyes need to focus distinct object, then ciliary muscles reflex which increases the focal length. The eye lens converges the light and the objects are said to be unaccommodated.
• When eyes need to focus nearby object, then ciliary muscles relaxes which decreases the focal length. The eye lens diverges the light and the objects are said to be accommodated.
• The accommodation power of eyes is as close as 25 cm and as far as infinity.