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Radii of curvatures (R)...

Radii of curvatures (R)

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The radii of the spheres whose parts form surfaces of the lenses are called radii of curvatures.
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A point source of light is placed at the centre of curvature of a hemispherical surface. The radius of curvature is r and the inner surface is completely reflecting. Find the force on the hemisphere due to the light falling on its if the source emits a power W.

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