A concave mirror of focal length 12 cm is placed at a distance of 60 cm from a wall. How far from the wall an object be placed so that its sharp image formed by the mirror falls on the wall?
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Explanation:
Given,
Focal length f=20cm
Image distance, v=50cm
from mirror formula,
f1=v1+u1
⇒ −201=−501+u1
u1=501−201
=50×2020−50
=1000−30
u=−3100cm
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