Diffraction of Light

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Diffraction of Light: Overview

In this topic, we will learn about the phenomenon of diffraction of all types of waves such as sound wave, light wave or water wave. Diffraction by a single slit is also explained here.

Important Questions on Diffraction of Light

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The intensity maximum at the central maximum on the diffraction pattern is due to_____ interference.

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The intensity of secondary maxima less than the central bright band in diffraction pattern.

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Why is the intensity of secondary maxima less than the central bright band in diffraction pattern?

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A second minimum occurs at point P2 in direction of θ is given by θ=2θa.

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What is the position of secondary maxima and minima?

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The condition for obtaining secondary maxima in the diffraction pattern due to single slit is 

 dsinθ=2n-1λ2

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In a Fraunhofer diffraction at single slit of width d with incident light of wavelength 5500A°, the first minimum is observed at angle 30°. The first secondary maximum is observed at an angle θ=

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What is the condition of Nth minima in diffraction?

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Interference pattern is obtained as the result of interaction of light coming from two same wavefronts from two sources but diffraction pattern is obtained as the result of interaction of light coming from different part of the different wavefront.

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Interference fringes are of the same width while diffraction fringes are not of the same width.

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In interference pattern, all bright bands are of same intensity while in diffraction pattern all bright bands are not of same intensity. 

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Discuss the diffraction grating and obtain the condition of  m th Maximum,

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Mention the difference between interference and diffraction.

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Discuss the special case of first minima in Fraunfofer's diffraction.

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What is diffraction?

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To observe diffraction, we need at least two slits and a light source.

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The phenomenon of deviation of light when it goes over a sharp edge is called interference.

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To observe diffraction, we need only a single slit, but for interference, we need two slits.

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Interpret Fraunhofer diffraction through single slit.

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What do you mean by diffraction of light? Why diffraction of sound waves are easily observed than diffraction of light waves? Compare Fresnel's and Fraunhofer diffraction.