Question

Two waves, each of amplitude 'a' and frequency 'ω' emanating from two coherent sources of light superpose at a point. If the phase difference between the two waves is φ, obtain an expression for the resultant intensity at that point.

What is the effect on the interference pattern in Young's double-slit experiment when (i) the source slit is moved closer to the plane of the slits, and (ii) the separation between the two slits is increased ? Justify your answers.

Give any two differences between the interference pattern obtained in Young's double-slit experiment and a diffraction pattern due to a single slit.

Draw an intensity distribution graph in case of a double-slit interference pattern.