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Wave Equation

Light waves p...

Question

Light waves producing interference have their amplitudes in the ratio 3:2. The intensity ratio maximum and minimum of interference fringes is :

A

36:1

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B

9:4

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C

25:1

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D

6:4

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Solution

The correct option is C 25:1
Amplitudes ratio is 3/2
Let amplitudes by $3 x$ and $2 x$
At maxima amplitudes add up giving $5 x$
At minima amplitudes substract giving $- x$
Intensity ratio $= \frac{25}{1}$
because Intensity is square of amplitude.

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