Q. 15.0( 1 Vote )

With reference to the functioning of the eye, answer the questions that follow:

(a) What is meant by the power of accommodation of the eye?

(b) What is the shape of the lens during (1) near vision (2) distant vision ?

(c) Name the two structures in the eye responsible for bringing about the change in the shape of the lens.

(d) Name the cells of the retina and their respective pigments which get activated

Answer :

(a) The ability of the eye to focus sharply on things which are near to the eye as well as far off is known as the power of accommodation.

(b) (1) near vision – flattened or less convex

(2) distant vision – rounded or more convex

(c) Ciliary muscles and suspensory ligament

(d) (1) in the dark - Cells - rod cells, Pigment - rhodopsin

(2) in the light - Cells - cone cells, Pigment – iodopsin

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