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Q.

A point object is placed on the principal axis of a concave mirror of focal length 20cm. At this instant object is given a velocity v towards the axis (event-1) or perpendicular to axis (event-2). Then, speed of image

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a

in event-2 is 2v

b

in event-2 is 4v

c

in event-1 is 2v

d

in event-1 is 4v

answer is B, C.

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Detailed Solution

1v+1-30=1-20

Solving we get,

v=-60cm m=-vu=--60-30=-2

Speed of image (in event-1) is m2 times and m times in event-2.

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