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  • A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.

A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her? Draw ray diagram for the correction of this defect.

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Ans.  

Myopia - short sightedness.
In myopia, a person can see nearby objects clearly but cannot see distant objects clearly.
The doctor advices a concave lens of suitable power to bring the image back onto the retina. This is shown as follows:

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