1.

A concave mirror of focal length 20cm is placed 50cm from a wall. How far from the wall an object is placed to form its real image on the wall?

Answer»

SOLUTION :V=-50cmF=-20cm
From mirror FORMULA 1/u=1/f-1/v=-1/20+1/50=-3/100
U=-33.3cm
THEREFORE the distance of the OBJECT from the wall x=50-u
X=50-33.3=167.7cm


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