The plane face of a planoconvex lens is silvered. The refractive index of material and…
Physics · Class 12 · CBSE — Ray Optics & Optical Instruments
The plane face of a planoconvex lens is silvered. The refractive index of material and radius of curvature of the curved surface of the lens are \(n\) and \(R\) respectively. This lens will behave as a concave mirror of focal length
- \(\frac{R}{n}\)
- \(\frac{{R}}{({n}-1)}\)
- nR
- \(\frac{{R}}{2({n}-1)}\)
Answer
(D) R 2( n -1)
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