In Michaelson interferometer, the position of mirror read 0.6025mm and 0.8970mm for a pair of consecutive bright. Mean wavelength of light is 5393 Å. The difference between the two wavelengths is?
A.
3 Å
B.
4 Å
C.
5 Å
D.
6 Å
Answer: Option D
Explanation:
d = 0.8970 – 0.6025 = 0.2945 mm = 2.945 X 10-4m λ = 5893 X 10-10m λ2–λ1 = λ22d = 5893 X 5893 X 10-20/2 X 2.945 X 10-4 = 6 Å.