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प्रश्न
State Huygens’s principle. Show, with the help of a suitable diagram, how this principle is used to obtain the diffraction pattern by a single slit.
Draw a plot of intensity distribution and explain clearly why the secondary maxima becomes weaker with increasing order (n) of the secondary maxima.
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उत्तर
Huygen’s principle states that
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Each point on a wave front behaves as a source of secondary wavelets
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The secondary wavelets travel with the speed of light in that medium
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The position of new wave front at a later time can be found out by drawing a common tangent to all these secondary wavelets
Intensity distribution of single slit distribution
For the first secondary maxima (n = 1), only one-third of the slit contributes to its intensity.
Secondly, for n = 2, only one-fifth of the slit contributes to the intensity.
Therefore, with increasing n, the intensity decreases.
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संबंधित प्रश्न
What is the shape of the wavefront in the following case?
The portion of the wavefront of light from a distant star was intercepted by the Earth.
You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.
Derive the law of reflection using Huygen’s Wave Theory.
Answer the following question.
Define the term wavefront. Using Huygen's wave theory, verify the law of reflection.
According to Huygens principle, ______.
What is the geometrical shape of the wavefront for:
- Light diverging from a point source?
- The pattern of wavefront of the light from a distant star intercepted by earth?
Wavefront means
Huygen's conception of secondary waves ______.
What is the shape of the wavefront on earth for sunlight?
According to Huygens’s principle, the amplitude of secondary wavelets is ______.
