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.

Assertion: The image distance in the eye increases, when we increase the distance of an object from the eye. Reason: For normal eye, image distance in the eye is fixed, being equal to distance of retina from the eye lens. The focal length of the eye lens is changed on account of accommodation power of the eye.

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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.

What is meant by accommodation of the eye ?

The number of ways in which four passangers be accommodate in three railway carriages,if each carriage can accommodate any number of passangers,is