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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 converge at a distance L such that

A

`L = 20 cm`

B

`L =10 cm`

C

`L =40cm`

D

`L = 20//3 cm`

Text Solution

Verified by Experts

The correct Answer is:
A
`1/f = (mu - 1)[1/(R_1) - 1/(R_2)]`
`1/f = 1/20`
`f = 20 cm`
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