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Q.

A beam of light converges towards a point O, behind a convex mirror of focal length 20cm. The magnification of image if the point O is 10cm behind the mirrors is

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a

2

b

1.33

 

c

1.5

d

3

answer is B.

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Detailed Solution

v=ufu−f=10×1010−20=−20cm  Magnification =−vu=−−2010=2

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