Question

While travelling by Delhi metro, you would have seen a big spherical mirror on the platform for safety. If the metro was 2.0m away from the mirror, its image was formed 5cm inside the mirror. Determine: (3) b) The focal length of the mirror c) The magnification of the image

Answer 1

ANSWER: THE MIRROR IS A CONVEX MIRROR, the focal length is 5.12cm and the magnification of the image is 0.025.

Explanation:

to calculate focal length = 1/f=1/v+1/u

1/f= 1/5+1/-200

1/f=1/5-1/200

1/f=(40-1)/200

1/f=39/200

f=5.12

and now to calculate magnification = M =-v/u

M=5/-200

M=0.025

Therefore as it is a CONVEX mirror the image formed will be diminished, erect and virtual image is formed

Answer 2

Answer:

0.025

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