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Question
Assertion :The eye is said to have power of accomodation . Reason: Ciliary muscles alters the shape of the lens for near or far vision during accomodation.
Assertion :The eye is said to have power of accomodation . Reason: Ciliary muscles alters the shape of the lens for near or far vision during accomodation.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The choroid is the middle layer of eyeball which is connected in front
to a thick structure called ciliary body. Thread like suspensory
ligaments extend from the ciliary body and get attached to a biconvex,
transparent elastic Lens. For proper vision, light rays from a visual
object must be focussed sharply and precisely on the retina. In the
resting eye, the ciliary muscles remain relaxed, keeping the suspensory
ligaments stoutly stretched which flattens the elastic lens to reduce
its curvature. The lens in this resting eye focusses parallel rays from
distant objects (more than 6 m away) on the retina. But to increase
the power of the lens for focusing divergent rays from object on the
retina. a reflex called accomodation is needed. The eye has got the
property to form image of both near and far objects on the retina by
changing the convexity of the lens. This is known as the power of accomodation.So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.
The choroid is the middle layer of eyeball which is connected in front to a thick structure called ciliary body. Thread like suspensory ligaments extend from the ciliary body and get attached to a biconvex, transparent elastic Lens. For proper vision, light rays from a visual object must be focussed sharply and precisely on the retina. In the resting eye, the ciliary muscles remain relaxed, keeping the suspensory ligaments stoutly stretched which flattens the elastic lens to reduce its curvature. The lens in this resting eye focusses parallel rays from distant objects (more than 6 m away) on the retina. But to increase the power of the lens for focusing divergent rays from object on the retina. a reflex called accomodation is needed. The eye has got the property to form image of both near and far objects on the retina by changing the convexity of the lens. This is known as the power of accomodation.
So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.
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