Question

3.
Differentiate between:
(a) rod-shaped and cone-shaped cells
(b) near point and far point of human eye​

Answer 1

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Rods and Cones are the photoreceptors found in the eye, rods have rod-like structure and provide twilight vision, while cones are of the cone shape, fewer in number and provides the vision in the day or bright light. Rods are found around the boundary of the retina, whereas cones are there in the centre of the retina.

The near point of the eye is the minimum distance of the object from the eye, which can be seen distinctly without strain. ... The far point of the eye is the maximum distance to which the eye can see the objects clearly. The far point of the normal human eye is infinity.

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Answer 2

Answer:

(a) the rod-- shaped cells presents of the

human eye; they are sensitive to the amount of light energy falling on the retina; they can function even in quit dim light.

the cone -shaped cells, present in the retina of human eye are responsible for vision. they function best in relatively bright light.

(b) the minimum distance ,at which objects can be seen most distinctly is called near point of human eye.

the farthest point up to which the eye can see object clearly is called far point of human eye.