Optics Question 1045

Question: Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio

[UPSEAT 2002]

Options:

A) 25 : 1

B) 5 : 1

C) 9 : 4

D) 25 : 16

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}}\Rightarrow \frac{I _{1}}{I _{2}}=\frac{9}{4} $



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