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Asked by sarveshvibrantacademy | 22 May, 2019, 12:08: PM
answered-by-expert Expert Answer
In Fresnel biprism experiment,
Fringe width,
 
beta space equals space fraction numerator lambda left parenthesis D plus a right parenthesis over denominator 2 a alpha left parenthesis mu space minus space 1 right parenthesis space end fraction w h e r e comma space a space minus space d i s tan c e space b e t w e e n space s o u r c e space a n d space b i p r i s m space D space minus space d i s tan c e space b e t w e e n space b i p r i s m space a n d space s c r e e n space alpha space minus space a n g l e space o f space p r i s m space 
 
For parallel coherent beam, 
lim a → ∞
 
Thus, 
beta space equals space fraction numerator lambda over denominator 2 alpha left parenthesis mu space minus space 1 right parenthesis end fraction 
Thus, correct option is (a) 
Answered by Shiwani Sawant | 22 May, 2019, 14:33: PM
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