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  4. A single slit is used to observe diffraction pattern with red light. on replacing the red light with violet light the diffraction pattern would:

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Q. A single slit is used to observe diffraction pattern with red light. on replacing the red light with violet light the diffraction pattern would:

Bihar CECEBihar CECE 2005Wave Optics

Solution:

In diffraction pattern, fringe width is proportional to $ \lambda . $ We know that wavelength of violet light is less than that of red light, so on replacing red light with violet light, diffraction pattern would become narrower.