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Double-convex lenses are to be manufactu...

Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces of the same radius of curvature. What is the radius of curvature required if the focal length is to be 20cm?

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R = 22cm
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NCERT BANGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-EXERCISES
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