The wave nature of light is verified by

Consider the interference of two sources with intensities $I$ and $4I$. Find the intensity at a point where the phase difference is $\pi/2$. (in $I$)

Two coherent sources whose intensity ratio is $64: 1$ produce interference fringes. The ratio of intensities of maxima and minima is

In an interference pattern obtained by two coherent sources,the variation in intensity is $5\%$ of the average intensity. Find the ratio of the intensities of the two sources.

If $L$ is the coherence length and $c$ is the velocity of light,the coherence time is

To demonstrate the phenomenon of interference,we require two sources which emit radiation: