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Focal length of the piano – convex lens is ………………… when its radius of curvature is R and n is refractive index of the lens. A) \(\frac{-R}{n-1}\)B) \(\frac{n-1}{R}\)C) \(\frac{R}{n-1}\)D) \(\frac{n-1}{-R}\) |
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Answer» Correct option is C) \(\frac{R}{n-1}\) |
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