Answer in Brief

Is it necessary to have two waves of equal intensity to study interference pattern? Will there be an effect on clarity if the waves have unequal intensity?

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#### Solution

Interference pattern can be studied with waves of unequal intensity.

\[I =I_1 + I_2 + 2\sqrt{\left[ I_1 \times I_2 \right]}\cos\left( \phi \right),\]

where

\[\phi =\text{ phase difference}\]

In case of waves of unequal intensities, the contrast will not be clear, as the minima will not be completely dark.

Concept: Introduction of Wave Optics

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