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Q.

A biconvex lens is made of glass with  refractive index 1.5 and radii of curvature 20 cm and 30 cm. if the surface whose radius is 20 cm silvered, the effective focal length of the optical device formed isQuestion Image

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a

6011cm

b

6011cm

c

7911cm

d

6911cm

answer is A.

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Detailed Solution

1feq=1fL+1fm+1fL and 1fL=(μ1)1R1+1R2=(1.51)120+130=1230+2020×30=12×5020×30=5120;1feq=5120+220+5120=5+12+5120=22120feq=6011cmas it works as a concave mirror ,feq=6011cm

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