Young's Double Slit Experiment: Practice Problem & Solution

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Young's Double Slit Experiment. Understanding the underlying formula is key to arriving at the correct answer below:

The fringe width \( \beta \) in Young's double slit experiment is given by \( \beta = \frac{\lambda D}{d} \). Hence, \( \beta \) increases when slit-to-screen distance \( D \) increases, wavelength \( \lambda \) increases, or slit width separation \( d \) decreases.