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For a plane convex lens (mu 1.5) has ra...

For a plane convex lens `(mu 1.5)` has radius of curvature 10 cm. It is slivered on its plane surface. Find focal length after silvering:

A

10 cm

B

20 cm

C

15 cm

D

25 cm

Text Solution

Verified by Experts

The correct Answer is:
A
Equivalent power of combination
`P_(eq) = 2P_(L) + P_(M)`
`= 2(mu - 1) ((1)/(R )) + 0`

The required focal length
`F = (1)/(P_(eq)) = (R )/(2(mu - q)) = (10)/(2(1.5 - 1)) = - 10 cm`
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