Question

A is an essential condition for coherent sources. Here, A refers to

• A. constant phase difference
• B. equal amplitude
• C. Both (a) and (b) are correct
• D. Both (a) and (b) are incorrect

Answer 1

The correct option is A

constant phase difference

Explanation for the correct option:

Correct option is A

1. Coherent source of light are those sources of light which emit light waves of same wavelength, same frequency and are in same phase or having constant phase difference.
2. For sources to be coherent it is necessary that their initial phase difference remains the same or constant.
3. Here, A refers to constant phase difference.

Explanation for the incorrect option:

B. equal amplitude

1. If coherent source satisfy all the necessary condition such as same wavelength, same frequency and are in same phase or having constant phase difference then they have different amplitude

Hence, correct option is A