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} $



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