If the distance between a point source and a screen is doubled,then the intensity of light on the screen will become:

To observe a stationary interference pattern formed by two light waves,it is not necessary that they must have :

Two waves having amplitudes in the ratio $5:1$ produce interference. The ratio of the maximum to minimum intensity is

Two point sources $S_1$ and $S_2$ separated by a distance $10 \mu m$ emit light waves of wavelength $4 \mu m$ in phase. $A$ circular wire of radius $40 \mu m$ is placed around the sources as shown in the figure,where $O$ is the centre of the circle and $OS_1 = OS_2$. Determine the nature of the interference at points $A, B, C,$ and $D$.

If the amplitude ratio of two sources producing interference is $3:5$,the ratio of intensities at maxima and minima is

The phenomenon of interference is shown by