Question
Question: In YDSE, we get 60 fringes in field of view for light of wavelength 4000 Å. If we use light of wavel...
In YDSE, we get 60 fringes in field of view for light of wavelength 4000 Å. If we use light of wavelength 6000 Å, the number of fringes obtained in the same field of view are
A
60
B
90
C
40
D
15
Answer
40
Explanation
Solution
n1l1 = n2l2
60 × 4000 = n2 × 6000
\ n2 = 40