Question

The Young's double slit interference experiment is performed using light consisting of \(480\ \text{nm}\) and \(600\ \text{nm}\) wavelengths to form interference patterns. The least number of the bright fringes of \(480\ \text{nm}\) light that are required for the first coincidence with the bright fringes formed by \(600\ \text{nm}\) light is:

• A. \(4\)
• B. \(8\)
• C. \(6\)
• D. \(5\)

Hint:

For first coincidence of bright fringes, use \(n_1\lambda_1=n_2\lambda_2\) and take the smallest whole number ratio.

Answer 1

The Correct Option is D