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The plane surface of a plano-convex lens...

The plane surface of a plano-convex lens of refracting index 1.5, is silvered. The radius of curvature of curved surface is R. Find the focal length of the mirror thus formed.

Text Solution

Verified by Experts

`1/f_("lens") = (1.5-1)(1/R - 1/infty) implies f_("lens")=2R`
`P_("mirror") = 1/(2R) - 1/oo + 1/(2R)= 1/R implies f_("mirror")=-R` (Concave mirror)
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