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A double convex thin lens made of glass ...

A double convex thin lens made of glass (refractive index `mu=1.5`) has both radii of curvature of magnitude 20 cm. Incident light rays parallel to the axis of the lens will convature at a distance L such that

A

L = 20 cm

B

L = 10 cm

C

L = 40 cm

D

`L = frac(20)(3) cm`

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