Question

a student can not see clearly a chart hanging on a wall placed at distance of 3m from his eye name the defect of vision he is suffering from. drow a ray diagram to insulate this defect . list its two possible causes​

Answer 1

AnswEr :

A student cannot able to see a chart hanging on a wall placed at distance of 3m from his eyes, it means he is suffering from Myopia defect.

Myopia is a defect of an eye in which a defected person can't able to see distant object but he can able to see near object very clearly.

Two causes of Myopia are as follow :

1. Elongation of eye ball
2. Decrease in focal length of eye lens

This defect is corrected by using concave lens

Answer 2

Answer:

A student can not see clearly a chart hanging on a wall placed at distance of 3m from his eye because he is suffering from Myopia.

In this defect, a person can see nearby objects clearly but cannot see distant objects clearly. In this case, image formed before retina not on the retina.

The two causes possible are:-

• Excessive curvature of eye lens,

• Elongation of the eyeball.

As a result, the images formed before retina.

⟹ Ray diagram to insulate this defect is in the attachment.

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