Question

a concave mirror forms 2 times and real image of an object placed at 15cm from its pole . determine the distance of image from mirror and focal lenght of the mirror

Answer 1

Hiiii,


m= 2
u=-15cm. [sign convention]
M=-V/U
V=-MU=-2(-15)=30cm
Using, 1/f=1/u+1/v
1/f=1/-15+1/30= 1/30
F= 30cm

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Answer 2

here u=-15
-v/u=2
-v=-15×2
-v=-30
v=30
1/v+1/u=1/f