The resultant amplitude of coherent sources depends on ......

Two coherent sources of intensities,$I_1$ and $I_2$ produce an interference pattern. The maximum intensity in the interference pattern will be

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

Two coherent sources of intensities $I$ and $4I$ interfere. The maximum and minimum intensities of the resultant wave are:

Light from two coherent sources of the same amplitude $A$ and wavelength $\lambda$ illuminates the screen. The intensity of the central maximum is $I_{0}$. If the sources were incoherent,the intensity at the same point will be

If the wavelength of light is $4000 \, Å$, then the number of waves in a length of $1 \, mm$ will be: