Optics Question 1005
Question: The ratio of intensities of two waves is 9 : 1. They are producing interference. The ratio of maximum and minimum intensities will be
[MNR 1987 MP PET 1999; AMU (Engg.) 1999; AIIMS 2000]
Options:
A) 10 : 8
B) 9 : 1
C) 4 : 1
D) 2 : 1
Show Answer
Answer:
Correct Answer: C
Solution:
$ \frac{{I _{\max }}}{{I _{\min }}}={{( \frac{\sqrt{\frac{I _{1}}{I _{2}}}+1}{\sqrt{\frac{I _{1}}{I _{2}}}-1} )}^{2}}=( \frac{\sqrt{\frac{9}{1}}+1}{\sqrt{\frac{9}{1}}-1} )=\frac{4}{1} $
