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प्रश्न
Write two characteristics features distinguish the diffractions pattern from the interference fringes obtained in Young’s double slit experiment.
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उत्तर
Two characteristic features distinguishing the diffraction pattern from the interference fringes obtained in Young’s double slit experiment are as follows:
1. The interference fringes may or may not be of the same width whereas the fringes of diffraction pattern are always of varying width.
2. In interference the bright fringes are of same intensity whereas in diffraction pattern the intensity falls as we go to successive maxima away from the centre, on either side.
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संबंधित प्रश्न
In Young's double slit experiment, plot a graph showing the variation of fringe width versus the distance of the screen from the plane of the slits keeping other parameters same. What information can one obtain from the slope of the curve?
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A double slit S1 − S2 is illuminated by a coherent light of wavelength \[\lambda.\] The slits are separated by a distance d. A plane mirror is placed in front of the double slit at a distance D1 from it and a screen ∑ is placed behind the double slit at a distance D2 from it (see the following figure). The screen ∑ receives only the light reflected by the mirror. Find the fringe-width of the interference pattern on the screen.
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(i) Distance between the two slits.
(ii) Fringe width, i.e. fringe separation.
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Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (λ = 632.8 nm). The distance between the screen and the slits is 100 cm. If a bright fringe is observed on a screen at distance of 1.27 mm from the central bright fringe, then the path difference between the waves, which are reaching this point from the slits is close to :
