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 The Shadow in a Sphere (Posted on 2009-08-19)
Consider a hollow sphere of radius R, in which a light source is placed at its centre. A square plate of side length S is held in place within the sphere by a pole of length L units. The square plate's position is then such that the displacement between the centre of the square and the light source is R-L units.

The square plate is also oriented in a way such that an imaginary line drawn perpendicular to the surface of the plate and passing through the plate's centre will pass through the light source.

Determine the surface area of the shadow formed on the spherical shell, due to the square plate.

 No Solution Yet Submitted by Chris, PhD Rating: 4.0000 (4 votes)

 Subject Author Date Long way around solution, but it works... TheKPAXian 2009-10-01 16:53:38 re(2): Solution Charlie 2009-08-20 00:33:46 re: Solution Charlie 2009-08-19 19:29:41 solution Charlie 2009-08-19 19:22:12 Solution Bractals 2009-08-19 18:14:21 re: clarification Charlie 2009-08-19 12:45:49 clarification Daniel 2009-08-19 11:53:35

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