Question

In youngs double slit experiment the width of 20bright fringes is 4mm when illuminated by a light of wavelengths 650nm and the separation of the slits is 0.5mm. If the slits are illuminated by a light of wavelengths 500nm , find the distance through which screen should be shifted so that the bandwidth remains the same

Answer 1

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$\beta \gamma e \sec( \cos(?) )$