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Q.

A point object is moving with speed of 10 cm/s infront of converging lens along the principal axis as shown in figure. At this instant, the speed of the image is

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a

30 cms−1

b

32 cms−1

c

44 cms−1

d

40 cms−1

answer is C.

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Detailed Solution

1v−1u=1f

⇒1v−1−30=120

⇒1v=120−130=3−260=160

⇒v=60cm−1

Vi=vu2V0=60302×10=40cms−1

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A point object is moving with speed of 10 cm/s infront of converging lens along the principal axis as shown in figure. At this instant, the speed of the image is