Question

2. The speed of light in air is 3 x 10^8 m/s. Calculate the speed of light in glass if the refractive
index of glass is 1.5.
​

Answer 1

Answer:

According to Snell's Law:  

sin r

sin i

​  

=  

n  

1

​  

 

n  

2

​  

 

​  

=  

v  

2

​  

 

v  

1

​  

 

​  

 and Refractive Index for air is ≈1

Substituting,  

1

1.5

​  

=  

v  

2

​  

 

3×10  

8

 

​  

 

Therefore, v  

2

​  

=  

1.5

3×10  

8

 

​  

=2×10  

8

 m/s

Explanation:

Answer 2

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