Physics-
General
Easy
Question
An object is placed 20 cm in front of a plano–convex lens of focal length 15 cm. The plane surface of the lens is silvered. The image will be formed at a distance
- 60 cm to the left of the lens
- 12 cm to the right of the lens
- 60 cm to the right of the lens
- 12 cm to the left of the lens
The correct answer is: 12 cm to the right of the lens
Focal length F of equivalent mirror is given by
or 
cm
The equivalent mirror will concave mirror of focal length 
cm.
Now for a spherical mirror,
Þ 
Þ 
v = –12 cm
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