Physics-
General
Easy
Question
A rod of glass (
= 1.5) and of square cross section is bent into the shape shown in the figure. A parallel beam of light falls on the plane flat surface A as shown in the figure. If d is the width of a side and R is the radius of circular arc then for what maximum value of 
light entering the glass slab through surface A emerges from the glass through B
- 1.5
- 0.5
- 1.3
- None of these
The correct answer is: 0.5
Consider the figure if smallest
angle of incidence q is greater than critical angle then all light will emerge out of B
Þ 
from figure 
Þ 
Þ 
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