Question

For sustained interference fringes in double slit experiment, essential condition/s is/are
(a) sources must be coherent
(b) the intensities of the two sources must be equal
Here, the correct option/s is/are

• A. Both (a) (b)
• B. Only (a)
• C. Only (b)
• D. Neither (a) nor (b)

Answer 1

The correct option is B Only (a)

For sustained interference fringes, the conditions are
a) Two sources of light must be coherent in nature and of same frequency.
b) Amplitude of interfering light waves must be same.