Of the two slits producing interference in Young's experiment, one is covered with glass so that light…
Of the two slits producing interference in Young's experiment, one is covered with glass so that light intensity passing is reduced to $50 \%$. Which of the following is correct?
Intensity of fringes remains unaltered
Intensity of bright fringe decreases and that of dark fringe increases
Intensity of bright fringe increases and that of dark fringe decreases
Intensity of both bright and dark fringes decreases
Solution
$\therefore \quad$ The intensity of bright fringe decreases and dark fringe increases when one slit is covered. The reason behind this is that the bright fringes are produced when the amplitudes from both slits are in phase and added constructively.