Geometrical OpticsHard
Question
A ray of light strikes a cubical slab surrounded by air as shown in the figure. Than the geometrical path length traversed by the light in the slab will be :
Options
A.2√3 m
B.2m
C.6m
D.
m
mSolution
Critical angle
sin c = 1 ; sin c = 
Geometrical path length traveled by the light in the slab will be = 2 + 1 + 2 + 1 = 6m
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