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Lens Formula

ntplano conve...

Question

ntplano convex lens when silvered on plane side behaves like a concave mirror of focal length 30cm. When silvered on the convex side, it behaves like a concave mirror of focal length 10cm. What is refractive index of lens?n

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Q. A plano-convex lens when silvered on the plane side behaves like a concave mirror of focal length

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