A) two real coherent sources.
B) two virtual coherent sources.
C) a number of real coherent sources.
D) a number of virtual coherent sources.
Correct Answer: A
Solution :
Option [a] is correct Explanation: When monochromatic light through a narrow slit falls on Fresnel biprism that divides it into two components. One of these component is refracted from upper portion of biprism and the other one refracted through lower portion. Thus, two virtual coherent sources formed from the original source.
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