Basic Maths and Units and DimensionsHard

Question

Figure shows a transparent block of front sides ′a′ and ′a′. The third dimension of the block is negligible. 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. The region in which S should be present to satisfy this condition shown by shaded region. Choose correct option.
      

Options

A.
B.
C.
D.

Solution

                  
sin C = ; C = 30o
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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