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Huygen's theory of secondary waves can b...

Huygen's theory of secondary waves can be used to find-

A

velocity of light

B

the wavelength of light

C

wave from geometrically

D

magnifying power of microscope

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The correct Answer is:
C
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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)

ALLEN-WAVE OPTICS-Exercise 1 (Check your Grasp)
  1. Huygen's principle is applicable to

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  2. Accoring to huygen's theory of secondary waves, following can be expla...

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  3. Huygen's theory of secondary waves can be used to find-

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  4. The main drawback of huygen's theory was-

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  5. Wave nature of light follows because

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  6. The colour are characterized by which of following character of light-

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  7. Two coherent sources of intensities I1 and I2 produce an interference ...

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  8. Two wave are represented by the equations y(1)=asinomegat ad y(2)=acos...

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  9. The resultant amplitude of a vibrating particle by the superposition o...

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  10. The energy in the phenomenon of interference-

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  11. The phase difference corresponding to path difference of x is

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  12. The resultant amplitude in interference with two coherent sources depe...

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  13. Phenonmenon of interfernece is observed-

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  14. Two coherent sources must have the same

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  15. For the sustained interference of light, the necessary condition is th...

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  16. If the ratio of the intensity of two coherent sources is 4 then the vi...

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  17. Two monochromatic and coherent point sources of light are placed at a ...

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  18. If the distance between the first maxima and fifth minima of a double-...

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  19. In Young's double-slit experiment, the separation between the slits is...

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  20. In Young's double slit experiment using sodium light (lamda=5898Å) 92 ...

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