Optics Question 1021
Question: Two waves having intensity in the ratio 25 : 4 produce interference. The ratio of the maximum to the minimum intensity is
[CPMT 1999]
Options:
A) 5 : 2
B) 7 : 3
C) 49 : 9
D) 9 : 49
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{25}{4}}+1}{\sqrt{\frac{25}{4}}-1} )}^{2}}=\frac{49}{9} $
