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 |
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a) |
0 |
b) |
c) |
d) |

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 |
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a) |
0 |
b) |
c) |
d) |

1 Answer

127 votes

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 |

127 votes

127