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17/09/2020 5:51 pm
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When an object is kept at a distance of 30 cm from a concave mirror, the image is formed at a distance of 10cm from the mirror. If the object is moved with a speed of 9 cms–1, the speed (in cms–1) with which image moves at that instant is
(1) 4
(2) 5
(3) 1
(4) -1
1 Answer
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17/09/2020 5:56 pm
Correct answer: (4) -1
Explanation:
Velocity of image
vi = - v2/u2 x v0
= - 102/302(9)
= -1 cm/sec