Double convex lenses are to be manufactured from a glass of refractive index 1.55, with…
Physics · Class 12 · CBSE — Ray Optics & Optical Instruments
Double convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of same radius of curvature. What is the radius of curvature required if the focal length is to be 20 cm?
- 11 cm
- 22 cm
- 7 cm
- 6 cm
Answer
(B) 22 cm
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