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In Fresnel bi-prism experiment a coheren...

In Fresnel bi-prism experiment a coherent source and screen are placed at a distance very greater than size of prism. Angle `theta` is very small, if the source is shifted slightly vertically upward then

A

the width of region on screen where light falls through upper half of biprism remain unchanged.

B

The width of the region on screen in which light overlaps remain unchanged.

C

distance between two images formed by biprism remain unchanged.

D

None of the above

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