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Question

A plano concave lens is placed on a paper on which a flower is drawn. How far above its actual position does the flower appear to be ?

A
10 cm
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B
15 cm
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C
50 cm
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D
None
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Solution

The correct option is A 10 cm
This problem can be drawn as follows
Here we will consider the image is loacted on negative axis and the radius of curvature is on positive axis.
u=20 cm R=+20 cm
n1=32 n2=1
from n2vn1u=(n2n1)R
=1v+32×20=13220;v=10 cm
The flower appears to be 2010=10 cm above from initial position

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