A small coin is resting on the bottom of a beaker filled with a 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:
A
As shown in figure, a light ray from the coin will not emerge out of liquid if, 
therefore, minimum radius R corresponds to 
.
In 
Given, 
and 
But 
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