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Image Formation by Convex Lens

The speed of ...

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The speed of light in the material of a plano-convex lens is 1.5×10^8 m/s. If the radius of plano-convex lens is 4 cm and its thickness at the centre is 0.4cm, then the focal length of the lens is

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Q. Diameter of plano – convex lens is 6cm and thickness at the centre is 3 mm. If speed of light in material of lens is

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