Question

The path difference between two wavefronts emitted by
coherent sources of wavelength 5460Å is 2.1 micron. The
phase difference between the wavefronts at that point is
(a) 7.692 (b) 7.692 π
(c) 7.692/π
(d) 7.692/3π

Answer 1

Answer:

B

Explanation:

Phase diff. =  

λ

2πx

​  

 

Path difference =  

5460×10  

−10

 

2π×2.1×10  

−6

 

​  

 = 7.692 π radian.