The figure shows the square face (of side 'a') of a transparent cuboidal block. The thickness or the third dimension of the block is negligible in comparison to 'a'. The block has uniform refrative index mu equal to 2. A point source S which can emit light in all directions can move inside the block. It is desired that no light of 'S' should pass through AB. Sketch the region in which S should be present to satisfy this condition.

The figure shows the square face (of side 'a') of a transparent cuboid

1.	The figure shows the square face (of side 'a') of a transparent cuboidal block. The thickness or the third dimension of the block is negligible in comparison to 'a'. The block has uniform refrative index mu equal to 2. A point source S which can emit light in all directions can move inside the block. It is desired that no light of 'S' should pass through AB. Sketch the region in which S should be present to satisfy this condition.
Answer» Solution :`sin C=(1)/(2),C=30^(@)` If `S` is ANYWHERE in the shaded region, the LIGHT RAYS from `S` will strike `AB` MAKING an angle more than critical angle.

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