Which phenomena can be explained by the wave nature of light?

The resultant amplitude in interference with two coherent sources depends upon:

Two coherent plane light waves of equal amplitude make a small angle $\alpha (\alpha \ll 1)$ with each other. They fall almost normally on a screen. If $\lambda$ is the wavelength of the light waves,the fringe width $\Delta x$ of the interference pattern of the two sets of waves on the screen is:

$A$ ray of light from a monochromatic point source of light is incident at a point on the screen. If a thin mica film of thickness $t$ and refractive index $n$ is introduced in its path,then the optical path

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

If two sources emit light waves of different amplitudes, then in the interference pattern: