Light enters at an angle of incidence in a transparent rod of refractive index 
. For what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateral face whatsoever be the value of angle of incidence?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Let a ray of light enter at 
and the refracted beam is 
. This is incident at an angle 
. For no refraction at the lateral face, 
or, 
But 
or 
From Snell's law, 
equation gives
Also, 
or 
or 
or 
Maximum value of 
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