a person is not able to read from a book until he kept at 50 cm determine the power of correct lens
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0.5 is the power of len
mohali29:
-0.5 is correct answer
Nope.
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Hey!
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As the person can clearly read the book if he keeps the book at 50 cm, then,
Focal length ( f ) = 50 cm = 0.5 m
Power = 1 / f = 1 / 0.5
= 1 × 10 / 5
= 2 D
Power is 2D.
____________
Hope it helps...!!!
____________
As the person can clearly read the book if he keeps the book at 50 cm, then,
Focal length ( f ) = 50 cm = 0.5 m
Power = 1 / f = 1 / 0.5
= 1 × 10 / 5
= 2 D
Power is 2D.
____________
Hope it helps...!!!
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