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(a) What should be the phase difference between two identical light sources so that the total...

(a) What should be the phase difference between two identical light sources so that the total intensity is equal to the intensity of one light source.

(b) When a diffraction grating is immersed in water, Explain what change occur to the angular position of maxima.

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Answer #1

b). When the diffraction grating is immersed in the water (including the whole apparatus) the wavelength of the light decreases. The principle maxima of a diffraction grating are given as :

So wavelength in water becomes:

  

Thus the angle locating the principle maxima of a diffraction grating immersed in water will be smaller than when the apparatus is in the air. So the principle maxima will be closer together.

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