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A plano-convex lens of unknown material and unknown focal length is given.

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A plano-convex lens of unknown material and unknown focal length is given. With the help of a spherometer we can measure the :

(1) refractive index of the material
(2) focal length of the lens
(3) radius of curvature of the curved surface
(4) aperture of the lens

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(3) radius of curvature of the curved surface

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