Question

in an intensity pattern with two coherent sources the amplitude of intensity variations is found to be 5% of the average intensity. Calculate the relative intensities of the interfering sources.​

Answer 1

Answer:

I  

min

​  

 

I  

max

​  

 

​  

=  

(a−1)  

2

 

(a+1)  

2

 

​  

 

where amplitude ratio of two sources is assumed to be a:1

Let the average intensity be 100 units, then I  

max

​  

=105 units and I  

min

​  

=95 units

95

105

​  

=  

(a−1)  

2

 

(a+1)  

2

 

​  

 which gives a=40

therefore,    

I  

min

​  

 

I  

max

​  

 

​  

=  

1

1600

​  

 

Explanation: