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Q. What are the differences between fringes obtained in Newton's ring experiment and those produced by a bi-prism.

Difference between Bi-Prism Fringes and Newton's rings

Newton's Rings	Bi-Prism Fringes
These fringes (rings) are formed by the way of division of amplitude.	These fringes are formed by the way of division of wave front.
These rings are circular in shape.	These fringes are straight in general.
In Newton's rings centre fringe may be dark or bright.	Centre fringe is always bright.
Fringe width is not constant.	The width of all the fringes is constant.
Broad light source is required to produce these rings.	Point (Narrow) light source is used to obtain these fringes.

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