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The defect of vision in which the eye-lens of a person gets progressively cloudy resulting in blurred vision is called :

Cataract is the clouding of the lens of human eye, that lies behind the iris and pupil. It leaves to a blurred vision or decrease in vision.

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97

The change in converging power of an eye-lens is caused by the action of:

 98

The size of the pupil of the eye is adjusted by:

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A person cannot see the distant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision called:

 101

A man stands 10 m in front of a large plane mirror. How far must he walk before he is 5 m away from his image?