"Bhargavi" able to read the printed letters text book, but unable
to read the letters on the black-board for away from her.
( Which type of eye defect she is suffering from?
(ii) Which type of lens is used to correct the defect?
(iii) Derive the formula for focal length of that lens.
C alon which has symmetrical
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Answer:
she is suffering from myopia in this defect she can't see far objects but can see near objects clearly
(ii)this defect can correct by using double concave lens.
(iii)it's minimum focal length is 2.27
lens formula=1=1- 1
f v u
formula:1=1=f=-D
f -D
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