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Q.

Radius of curvature of first surface of double convex lens is three times that of the other. If focal length of the lens is 30 cm and refractive index of the lens is  3/2, then radius of curvature of the first surface is

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a

60 cm

b

80 cm

c

40 cm

d

20 cm

answer is C.

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Detailed Solution

R1=2R,    R2=−R

1f=32−113R+1R

130=12R43

R=60cm

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