" Power of Accommodation "

(a) A student cannot see clearly a chart hanging on a wall placed at a distance of 3m from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. (b) Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length. (c) What do you mean by the 'Power of Accommodation' of human eye?

Assertion : Accommodation power is present in human eye but absent in frog eye. Reason : Iridial muscles are present in human eye but are absent in frog eye.

Answer the following questions : What is meant by accommodation power ? How is it brought about ?

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Answer the following questions. Fill in the blanks with correct words: An aged person suffering from __________ caused by the weak accommodation power of the eye lens associated with old age, should wear ___________ lenses.