Two plane mirrors, a source S of light, wmitting monochromatic rays of wavelength `lamda` and a screen are arranged as shown in figure. If angle `theta` is very small, calculate fringe width of the interference pattern formed by reflected rays.

Two plane mirrors, a source S of light, emitting wavelengths of lambda_(1) = 4000overset(@)A" and" lambda_(2) = 5600overset(@)A and a screen are arranged as shown in figure. The angle theta shown is 0.05 radian and distance a and b are 1 cm and 38 cm respectively. (a) Find the fringe width of interference pattern formed on screen by the blue light. (b) Calculate the distance of first black line from central bright fringe. (c) Find the distance between two black lines which are nearest to the central bright fringe.

A ray of light is reflected by two perpendicular plane mirrors as shown. The angle theta is equal to:

A ray of light is reflected by two perpendicular plane mirrors as shown. The angle theta is equal to: