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Q.

A convex mirror of focal length f =10cm moving with velocity 2cm/s along principal axis as shown in the figure. For the given instant, an object moving on principal axis with velocity 10 cm/s and at a distance 20 cm from pole of mirror. The velocity of image at this instant is
 

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a

109cm/s

b

89cm/s

c

98cm/s

d

910cm/s

answer is C.

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