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A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maxima of the diffraction pattern the phase difference between the rays coming from the edges of the slit is

a)

0

b)

c)

d)


Question ID - 150146 | Top Ranker Answer | SaraNextGen

A parallel monochromatic beam of light is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first maxima of the diffraction pattern the phase difference between the rays coming from the edges of the slit is

a)

0

b)

c)

d)

1 Answer - 5876 Votes

3537

Answer Key : (d) -

(d)

The phase difference  between the wavelets from the top edge and the bottom edge of the slit is  where  is the slit width. The first minima of the diffraction pattern occurs at  so



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