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What is the shape of the wavefront in ea...

What is the shape of the wavefront in each of the following cases:
(a) Light diverging from a point source.
(b) Light emerging out of a convex lens when a point source is placed at its focus.
(c) The portion of the wavefront of light from a distant star intercepted by the Earth.

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(a) Spherical
(b) Plane
(c) Plane (a small area on the surface of a large sphere is nearly planar).
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Huygen was the figure scientist who proposed the idea of wave theory of light he said that the light propagates in form of wavelengths. A wavefront is a imaginary surface of every point of which waves are in the same. phase. For example the wavefront for a point source of light is collection of concentric spheres which have centre at the origin w_(1) is a wavefront w_(2) is another wavefront. The radius of the wavefront at time 't' is 'ct' in thic case where 'c' is the speed of light the direction of propagation of light is perpendicular to the surface of the wavelength. the wavefronts are plane wavefronts in case of a parallel beam of light. Huygen also said that every point of the wavefront acts as the source of secondary wavelets. The tangent drawn to all secondary wavelets at a time is the new wavefront at that time. The wavelets are to be considered only in the forward direction (i.e., the direction of propagation of light) and not in the reverse direction if a wavefront w_(1) and draw spheres of radius 'cDeltat' they are called secondary wavelets. Draw a surface w_(2) which is tangential to all these secondary wavelets w_(2) is the wavefront at time t+Deltat Huygen proved the laws of reflection and laws of refraction using concept of wavefront. Q. Spherical wavefronts shown in figure, strike a plane mirror. reflected wavefront will be as shown in

Huygen was the figure scientist who proposed the idea of wave theory of light he said that the light propagates in form of wavelengths. A wavefront is a imaginary surface of every point of which waves are in the same. phase. For example the wavefront for a point source of light is collection of concentric spheres which have centre at the origin w_(1) is a wavefront w_(2) is another wavefront. The radius of the wavefront at time 't' is 'ct' in thic case where 'c' is the speed of light the direction of propagation of light is perpendicular to the surface of the wavelength. the wavefronts are plane wavefronts in case of a parallel beam of light. Huygen also said that every point of the wavefront acts as the source of secondary wavelets. The tangent drawn to all secondary wavelets at a time is the new wavefront at that time. The wavelets are to be considered only in the forward direction (i.e., the direction of propagation of light) and not in the reverse direction if a wavefront w_(1) and draw spheres of radius 'cDeltat' they are called secondary wavelets. Draw a surface w_(2) which is tangential to all these secondary wavelets w_(2) is the wavefront at time t+Deltat Huygen proved the laws of reflection and laws of refraction using concept of wavefront. Q. Wavefronts incident on an interface between the media are shown in the figure. the refracted wavefront will be as shown in

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NCERT GUJARATI-WAVE OPTICS-EXERCISES
  1. Monochromatic light of wavelength 589 nm is incident from air on a wat...

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  2. What is the shape of the wavefront in each of the following cases: (...

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  3. (a) The refractive index of glass is 1.5. What is the speed of light i...

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  4. In a Young’s double-slit experiment, the slits are separated by 0.28 m...

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  5. In Young's double-slit experiment using monochromatic light of wavelen...

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  6. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is u...

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  7. In a double-slit experiment the angular width of a fringe is found to ...

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  8. What is the Brewster angle for air to glass transition? (Refractive in...

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  9. Light of wavelength 5000 Å falls on a plane reflecting surface. What a...

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  10. Estimate the distance for which ray optics is good approximation for a...

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  11. The 6563Å Halpha line emitted by hydrogen in a star is found to be red...

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  12. Explain how Corpuscular theory predicts the speed of light in a medium...

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  13. You have learnt in the text how Huygens’ principle leads to the laws o...

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  14. Let us list some of the factors, which could possibly influence the sp...

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  15. For sound waves, the Doppler formula for frequency shift differs sligh...

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  16. In double-slit experiment using light of wavelength 600 nm, the angula...

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  17. Answer the following questions: (a) In a single slit diffraction exp...

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  18. Answer the following questions: (b) In what way is diffraction from ...

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  19. Answer the following questions: (c) When a tiny circular obstacle is...

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  20. Answer the following questions: (d) Two students are separated by a ...

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