Q. 2

The muscles of a normal eye are least strained when the eye is focussed on an object
A. far away from the eye

B. very close to the eye

C. at about 25 cm from the eye

D. at about 1 m from the eye.

Answer :

Human eye lens has fibrous, jelly-like materials


Ciliary muscles change the curvature of the eye lens depending upon the distance of the object


that changes the focal length.


When the object is close to eye, the contraction required is more since the curvature of eye lens


has to change, and when the object is distance, less contraction of ciliary muscles takes place.

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