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PHYSICS PRACTICALS VIVA QUESTIONS
1. NEWTON’S RINGS
1) Explain interference?
The phenomenon in which alternate bright and dark bands are observed due to the superposition of light waves proceeding from two coherent sources of light is known as interference.
2) What are coherent sources?
Two sources are said to be coherent if they emit light waves of the same wavelength and start with same phase or have a constant phase difference.
3) Write the relation between path difference and phase difference?
4) By what method coherent sources are derived in the case of Newton’s rings?

The rays are derived from the same incident ray by the division of amplitude and therefore are coherent.
5) Explain fringes of equal optical thickness.
The occurrence of fringes of equal thickness is due to interference of light reflected from the front and rear boundaries of the film (fringes of equal thickness in reflected light) or of light transmitted directly through the film and light twice reflected at its boundaries (fringes of equal thickness in transmitted light).
6) Explain fringes of equal chromatic order.
Fringes which have same chromatic properties are called fringes of equal chromatic order.
7) Write the condition for maxima and minima.