Optics Question 1154
Question: What is the effect on Fresnel’s biprism experiment when the use of white light is made
[RPMT 1998]
Options:
A) Fringe are affected
B) Diffraction pattern is spread more
C) Central fringe is white and all are coloured
D) None of these
Show Answer
Answer:
Correct Answer: C
Solution:
With white light, the rays reaching the centre has zero path difference. So we get white fringe at the centre and coloured near the central fringe.
