Explain Biot-Savart law with a rough diagram and meanings of symbols used.
Explain the formation of interference fringes using Fresnel biprism when a monochromatic source of light is used. Derive an expression for the fringe width and explain how the wavelength of light is determined using this method.
Derive an expression for potential and electric field due to an electric dipole at an observation point distant r from the midpoint of the electric dipole.
