4/19/2023 0 Comments Interference and diffractionIt is also used to determine the wavelength of a light wave similarly to the methods mentioned earlier in single-slit diffraction and Young Double-Slit Experiment. It has a very large number of parallel lines on a glass or plastics obtained through grating process.Ī diffraction grating is often (but not only) used to split the white light into colours. The light intensity is a function of angle, i.e the intensity of light weakens when the angle increases.Ī diffraction grating tool is very similar in concept to the double-slit system discussed earlier but with more openings. When light passes through a single slit whose width a is on the order of the wavelength of the light, then we can observe a single slit diffraction pattern on a screen that is a distance D > a away from the slit. Since diffraction is observed only when the dimensions of the obstacle or gap are comparable to the wavelength, the diffraction of light waves can hardly be observed without using special techniques due to the very small wavelengths of light waves. As such, it possesses all properties of waves, including interference and diffraction. Light is an electromagnetic transverse wave. Interference and Diffraction of Light Revision Notes How to find wavelength of a light wave using diffraction gratings?.Why diffraction gratings are used in technology?.What Young Double-Slit Experiment is used for?.How to obtain light diffraction on a screen using a single slit?.Why diffraction and interference of light are related phenomena?.Is there any diffraction in light waves?.The width of diffraction fringes is always unequal.In these revision notes for Interference and Diffraction of Light, we cover the following key points: The width of interference fringes may or may not be equal. The intensity of minima is never zero and hence there is poor contrast between bright and dark bands. The intensity of minima is generally zero, and there is a good contrast between bright and dark fringes. In the case of diffraction, the bright bands are not of the same intensity. In the case of interference, all bright bands are of the same intensity. Interference is due to the superposition of two different wavetrains coming from two coherent sources.ĭiffraction is due to the superposition of secondary wavelets from different parts of the same wavefront. According to Fresnel, diffraction occurs due to mutual interference of secondary wavelets which are not blocked by obstacle.įollowing are the points of difference between Interference and Diffraction of Light- Interference For visible light, the diffraction phenomenon is not so common, because the wavelength of visible light is very small ( ≅10 -6m) and obstacles of this size are hardly available. In the case of sound waves and radio waves, diffraction is observed readily because the wavelength of these waves is large and obstacles of this size are readily available. Also, the diffraction becomes much more pronounced, when the size of the obstacle is comparable to the wavelength of light. Due to this, the light spreads into the regions of the geometrical shadow of the obstacle. At the points, where the resultant intensity of light is maximum, Interference is said to be constructive and at points, where the resultant intensity of light is minimum, the interference is said to be destructive.ĭiffraction- It is the phenomenon of bending of light around the corners of an obstacle in the path of light. Interference- Interference of light is the phenomenon of redistribution of light energy due to the superposition of light waves from two coherent sources.
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