Question

For sustained interference fringes in double-slit experiment, essential condition is/are

Here, the correct option(s)is/are

• A. both $\left(1\right)$ and $\left(2\right)$
• B. only $\left(1\right)$
• C. only $\left(2\right)$
• D. neither $\left(1\right)$ nor $\left(2\right)$

Answer 1

The correct option is B

only $\left(1\right)$

For sustained interference fringes, the conditions are

1. Two sources of light must be coherent in nature and of the same frequency.
2. The amplitude of interfering light waves must be the same.

Since only the first condition from the question statement is satisfying the criteria for sustained interference fringes, therefore option (B) is the correct answer.