OnlineCBT
Physics · PYQ NEET UG 2022
हिन्दीIn a Young’s double slit experiment, a student observes \( 8 \) fringes in a certain segment of screen when a monochromatic light of \( 600\text{ nm} \) wavelength is used. If the wavelength of light is changed to \( 400\text{ nm} \), then the number of fringes he would observe in the same region of the screen is:
Correct answer · Option 2
\( 12 \)
Explanation
Since the width of the region \( L = n_1 \beta_1 = n_2 \beta_2 \), we get \( n_2 = n_1 \frac{\lambda_1}{\lambda_2} = 8 \times \frac{600}{400} = 12 \).
