Optics Question 1100
Question: In Young’s double slit experiment, 62 fringes are seen in visible region for sodium light of wavelength 5893 Å. If violet light of wavelength 4358 Å is used in place of sodium light, then number of fringes seen will be
[RPET 1997]
Options:
A) 54
B) 64
C) 74
D) 84
Show Answer
Answer:
Correct Answer: D
Solution:
$ n _{1}{\lambda _{1}}=n _{2}{\lambda _{2}} $
$ \Rightarrow 62\times 5893=n _{2}\times 4358 $
$ \Rightarrow n _{2}=84. $
