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 = 30oIf 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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