A plano-convex lens ( f = 20 cm) is silvered at plane surface. The focal length will be
Physics · Class 12 · CBSE — Ray Optics & Optical Instruments
A plano-convex lens (f = 20 cm) is silvered at plane surface. The focal length will be
- 20 cm
- 40 cm
- 30 cm
- 10 cm
Answer
(D) 10 cm
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