Two coherent plane light waves propagating with a divergence angle \( \psi \ll 1 \) fall almost ...

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Two coherent plane light waves propagating with a divergence angle \( \psi \ll 1 \) fall almost normally on a screen. The amplitudes of the waves are equal. Demonstrate that the distance between the neighbouring maxima on the screen is equal to \( \Delta x=\lambda / \psi \), where \( \lambda \) is the wavelength.
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