Optics Question 1017
Question: If two light waves having same frequency have intensity ratio 4 : 1 and they interfere, the ratio of maximum to minimum intensity in the pattern will be
[BHU 1995; MP PMT 1995; DPMT 1999; CPMT 2003]
Options:
A) 9 : 1
B) 3 : 1
C) 25 : 9
D) 16 : 25
Show Answer
Answer:
Correct Answer: A
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{4}{1}}+1}{\sqrt{\frac{4}{1}}-1} )}^{2}}=\frac{9}{1} $
