Question

Refractive index of glass is 1.5. If the speed of light in vacuum is 3 X 108 m/s, find velocity of light in medium.

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Answer 1

Answer:

we know that refractive index n=  

speed of light in medium

speed of light in vacuum

​  

 

where c=3×10  

8

m/s

1.5=  

v

c

​  

 

v=  

1.5

3×10  

8

 

​  

 

v=2×10  

8

m/s

For critical angle we will use snell's law

C is critical angle

n  

glass

​  

sinC=n  

air

​  

sin90     n  

air

​  

=1

sinC=  

n  

glass

​  

 

1

​  

=  

1.5

1

​  

 

C=41.8  

o

Answer 2

Answer:

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