A parallel monochromatic beam of light is incident normally on a narrow slit and the resulting diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first minimum of the diffraction pattern, the phase diffraction between the waves coming from the edges of the slit is

A parallel monochromatic beam of light is incident normally on a narro

1.	A parallel monochromatic beam of light is incident normally on a narrow slit and the resulting diffraction pattern is formed on a screen placed perpendicular to the direction of incident beam. At the first minimum of the diffraction pattern, the phase diffraction between the waves coming from the edges of the slit is
Answer» 0 `pi/2` `pi` `2pi` SOLUTION :For first diffraction minima the path difference between the WAVELETS starting from the TWO ends of slit=`lamda` and so PHASE difference between them `=2pi`.

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