The focal length of a concave mirror is 50cm where an object is to be placed so that its image is two times magnified, real and inverted :
72cm
63cm
75cm
50cm
A
50cm
B
75cm
C
72cm
D
63cm
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Solution
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Given,
Focal length, f=50cm
Magnification, m=2
m=vu=2
v=2u
From mirror
formula,
1f=1v+1u
1f=12u+1u
u=3f2=3×502=75cm
Object Is
placed at 75cm from the mirror.
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