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Mirror Formula and Magnification

If object is ...

Question

If object is placed at 60 cm before the concave mirror. The object moves with velocity 20 cm/sec towards the mirror. The magnification is -1/2 at initial position. And if magnification after 1 sec is – 1 find out the average velocity of the image for above 1 sec period.

A

10 cm/sec

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B

20 cm/sec

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C

15 cm/sec

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D

5 cm/sec

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Solution

The correct option is A
10 cm/sec

m = -v/u

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