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Q.

A candle placed 20 cm from a lens, forms an image on a screen 50 cm on the other side of the lens.  The focal length and type of the lens should be

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a

14.28 cm, convex lens

b

14.28 cm, concave lens

c

20.56 cm, convex lens

d

20.56 cm, concave lens

answer is A.

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Detailed Solution

f=vuv+u⇒50×2070=100070⇒14.28cm
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