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Q.

Fovea centralis 

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a

lacks rods and cones

b

has the greatest visual acuity

c

is the point of exit of optic nerve

d

lies above the posterior pole of the eye ball

answer is B.

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Detailed Solution

Fovea centralis is a thinned-out portion of the retina where only the cones are densely packed. It is the point where the visual acuity (resolution) is the greatest.

The optic nerves leave the eye and the retinal blood vessels enter it at a point medial to and slightly above the posterior pole of the eye ball. Photoreceptor cells are not present in that region and hence it is called the blind spot.

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