Question

What is bi prism? Explain measurement of wavelength of monochromatic light using biprism

Answer 1

a triangularprism with vertex angle of nearly 180° used to obtain images of a single source in observing the interference of light — called also Fresnel biprism.

Answer 2

A double prism which extends from base to base, and contains a very small refracting angle is known as a Fresnel biprism.

• A double prism which extends from base to base, and contains a very small refracting angle is known as a Fresnel biprism. An experiment which is popularly known as the Fresnel biprism experiment demonstrates the interference caused by the wavefront division.
• A biprism is utilized to create the two coherent sources of light in case of the Fresnel's biprism experiment. When these two virtual sources have their waves collided, a certain pattern of bright and black fringes is seen on the screen. The biprism is created by extending from base to base, in a way uniting two identical thin prisms. The prism's acute angle is roughly half a degree, while its angle which is obtuse in nature, is roughly 179 degrees. Two virtual coherent light sources are created when a monochromatic light source is taken into position in front of the biprism.

Hence, a double prism which extends from base to base, and contains a very small refracting angle is known as a Fresnel biprism.

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