Question

at what distance should an object be placed in front of a cocncave mirror of focal length 50cm so that an image of triple of its size is formed

Answer 1

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33.3cm

Explanation:

f=50 cm

m=3

m=v/u

v=-3u

1/v+1/u=1/f

-1/3u+1/u=1/50

-1+3/3u=1/50

2/3u=1/50

2*50=3u

100=3u

u=100/3

u=33.33 cm