A small coin is resting on the bottom of a beaker filled with liquid. A ray of light from the coin travels upto the surface of the liquid and moves along its surface. How fast is the light travelling in the liquid?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
:
From figure, 
where 
is the critical angle.
Also, 
since 
Also 
or, 
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