Question

Which out of following cannot produce two coherent source?

• A. Lloyd's mirror
• B. Fresnel biprism
• C. Young's double slit
• D. Prism

Answer 1

The correct option is D Prism

Lloyd's mirror is used to produce to two coherent sources out of phase with each other, from a single source and its reflection form a mirror.

Fresnel biprism refracts light from a single source to create two virtual in-phase coherent sources.

Young's double slit produces two coherent sources by diffraction from two slits, phase depending upon the position of the source with respect to the slits.

However a single prism cannot produce two coherent sources.