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According to Huygens' construction, tang...

According to Huygens' construction, tangential envelope which touches all the secondary spaheres is the position of

A

original wavefront

B

secondary wavefront

C

geometrrical wavefront

D

extended wavefront

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The correct Answer is:
B
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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. A point source of light is placed at origin, in air. the equation of wavefront of the wave at time t, emitted by source at t=0 is (take refractive index of air as 1)

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

TARGET PUBLICATION-WAVE THEORY OF LIGHT -EVALUATION TEST
  1. According to Huygens' construction, tangential envelope which touches ...

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  2. lamdaa and lamdam are the wavelengths of light in air and medium resp...

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  3. A clear sheet of polaroid is placed on top of a similar sheet so that...

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  4. Unpolarised light of internsity 32 Wm^(-2) passes through three polari...

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  5. With what speed should a glaxy move with respect to us so that a certa...

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  6. A beam of unpolarised light having flux 10^(-2) watt falls normally on...

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  7. Assertion : If light is polarised by reflection, then the angle betwee...

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  8. The speactral line emitted by a star, has a wavelength of 6800 Å when ...

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  9. A cylindrical wavefront spreads form a line source which is comparable...

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  10. A lens of focal length f gives diffraction pattern of Fraunhoffer type...

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  11. A parallel beam of monochromatic light is incident on a glass slab at ...

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  12. For passage of monochromatic beam of light in a medium of refractive i...

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  13. Velocity of light in deamond is (2/5)^(th) that in air. Velocity of l...

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  14. For navigatio purpose, in polar regions

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  15. When a plane wavefront is incident on a double convex lens, the refrac...

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  16. As a spherical wavefront propagates, the amplitude (a) of a spherical ...

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  17. Assertion: Speed of light in glass is indep[endent of the colour of l...

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  18. Assertion : Stars are often photographed with the help of telescope fi...

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  19. Assertion : If theta is the angle between the planes of transmission ...

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  20. Ordinary light incident on a glass slab at the polarising angle suffer...

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  21. A mixture of plane polarised and unpolarised light falls normally on a...

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