A Fresnel bi-prism was used to obtain an interference fringe, the distance between the source and the prism was 30 cm, and the distance between the prism and the barrier was 70 cm. Find the distance between two consecutive fringes, given that the prism angle is 1, the refractive index of its material is 1.53 , and the wavelength of light is 5000 angstroms.

An experiment is setup to measure the diameter of the sphere in the diagram using sizing measurements based on interference. A thin piece of glass slab is placed one side of a highly reflective substrate. A yellow light created by Sodium wavelength = 589.3nm having a normally incident. Fringes can be observed on the glass from the interference. With a gap between the two bright fringes is measured to be g = 0.118mm, with an overall length for the setup to be L = 20mm. The setup will be placed in air having n = 1. What is the diameter of the sphere? W

There is a thin film of soap bubble of thickness d on air with a refractive index of n. When an incident light of wavelength is falling on the soap bubble it is creating a dark fringe and when the wavelength is falling it is creating a bright fringe of the same order at the same position on screen. Prove that the order of the fringe is From the above relation find the thickness of the soap bubble of refractive index 1.35 which is creating a bright fringe for 370nm and a dark fringe for 500nm.

Red light of vacuum wavelength 650 nm is travelling in non-magnetic glass with refractiveindex nG = 1.50, then meets an interface with air at an angle of incidence of 75 degrees,and total internal reflection occurs.Calculate the tangential component of the wavevector kG in glass; state two conditionson the transmitted wavevector kA on the air side; and show that this leads to an evanescent wave with amplitude decaying exponentially away from the boundary. Calculate thedistance over which the E-field amplitude drops by a factor of 1/e.