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Q.

The distance between an object and the screen is 100cm. A lens produces an image on the screen when the lens is place at either of the positions 40cm apart. The power of the lens is nearly

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a

3 diopters

b

5 diopters

c

2 diopters

d

9 diopters

answer is B.

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Detailed Solution

x+y=100−−−(1) y−x=40−−−(2) Solving equation (1) and (2) we gety = 70cm ; x = 30cmthe power of lens is 1f=1y+1x =10070+(10030)=10021≈5diopters

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