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The radius of curvature and centre of curvature of a lens are same.
(a)True
(b)False

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Important Questions on Optics
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One plano-convex and one plano-concave lens of the same radius of curvature but of different materials are joined side by side as shown in the figure. If the refractive index of the material of is and that of is, then the focal length of the combination is:

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If the whole set up is immersed in water without disturbing the object and the screen positions, what will one observe on the screen?

