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Q.

A plano convex lens of focal length 12 cm is made from glass(μ=3/2). It is to be used in air. Then radius of the curved surface is

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a

4 cm

b

24 cm

c

6 cm

d

8 cm

answer is C.

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Detailed Solution

f=12cm,R1=R2R2=∞,μ=32

Question Image

 

 

 

 

1f=(μ−1)1R1−1R2

112=32−11R1−1∞

112=12×1R∴1∞=0

R=122=6

R=6cm

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