Optics Question 1108

Question: In Young’s double slit experiment using sodium light $ (l=5898{AA}) $ , 92 fringes are seen. If given colour $ (l=5461{AA}) $ is used, how many fringes will be seen

[CPMT 1989; RPET 1996; JIPMER 2001, 02]

Options:

A) 62

B) 67

C) 85

D) 99

Show Answer

Answer:

Correct Answer: D

Solution:

$ (n _{1}{\lambda _{1}}=n _{2}{\lambda _{2}}) $

$ \frac{n _{1}}{n _{2}}=\frac{{\lambda _{2}}}{{\lambda _{1}}}\Rightarrow \frac{n _{1}}{92}=\frac{5898}{5461}\Rightarrow n _{1}=99 $



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