Two plane mirrors, a source $S$ of light, emitting monochromatic rays of wavelength $\lambda$ and a screen are arranged as shown in figure. If angle $\theta$ is very small, find the fringe width of the interference pattern formed by reflected rays.

Q. The point S is monochromatic source of light emitting light of wavelength $\lambda .$ At the point P at a distance x from the mirror as shown in the figure, interference takes place between two light rays one directly coming from source S and another after reflection from the mirror such that a maxima is formed. The value of x may be:

Q. In Lloyd's mirror experiment (Fig.) a light wave emitted directly be the source S (narrow slit) interferes with the wave reflected form a mirror M. As s result, an interference fringe pattern is formed on the screen Sc. the source and the mirror are separated by a distance l=100 cm. At a certain position of the source, the fringe width on the screen was equal to Δx=0.25 mm, and after source was moved away from the mirror plane by Δh=0.60mm, the fringe width decreased η=1.5 times. Find the wavelength of light.

Q. A monochromatic light source S of wavelength $440$ nm is placed slightly above a plane mirror M as shown. Image of S in M can be used as a virtual source to produce interference fringes on the screen. The distance of source S from O is $20.0$cm, and the distance of screen from O is $100.0$ cm (figure is not to scale). If the angle $\theta =0.50\times {10}^{-2}$ radians, the width of the interference fringes observed on the screen is?

Q. In the figure, $PQ$ represents a plane wave front and $AO$ and $BP$ the corresponding extreme rays of monochromatic light of wavelength $\lambda$. The value of angle $\theta$ for which the ray $BP$ and the reflected ray $OP$ interfere constructively is given by

Q. Consider the shown arrangement in which a monochromatic source $\left(S\right)$ of light, a plane mirror of length $D$ and a large screen are placed as shown in figure. If $\Delta y$ is the length of screen in which interference pattern is observed and $M$ is total number of maxima on the screen then