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Q.

A converging beam of light forms a sharp image on a screen.  A lens is placed in the path of the beam, the lens being 10cm from the screen.  It is found that the screen has to be moved 8 cm further away from the lens to obtain a sharp image. The focal length of lens is

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a

– 22.5 cm

b

– 40 cm

c

22.5 cm 

d

40 cm

answer is A.

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Detailed Solution

1v−1u=1f

118−1+10=1f1f=5−990=−490f=−22.5cm

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