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If a person can sees clearly at a distance of 100 cm, then find the power of lens used to see object at 40 cm,

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a

1.0 D

b

2.0 D

c

1.5 D

d

2.5 D

answer is C.

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Detailed Solution

Here u = 40, v = -100140-1100=1f5-2100=1ff=2003cmP=3200×100=32=1.5D

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