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Question

An object is placed at a distance of 25 cm from the pole of a spherical mirror which forms a real, inverted image on the same side of object at 31.5 cm from the pole. Calculate the focal length of mirror and find the nature of the mirror.


Solution

Given that,


Object distance,u=-25cm
Image distance=-31.5 cm
For a mirror,we know that,
1/f=1/v+1/u
=1/(-31.5) +1/(-25)
f=-13.93cm= -14 cm

This will be a concave mirror.


Physics

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