WBJEE 2019 Physics Solved Paper

When the frequency of the light used is changed from 4 ×1014s−1 to 5 ×1014s−1, the angular width of the principal (central) maximum in a single slit Fraunhoffer diffraction pattern changes by 0.6 radian. What is the width of the slit (assume that theexperiment is performed in vacuum) ?