A monochromatic plane wave of speed c an...

A monochromatic plane wave of speed c and wavelength `lamda` is diffracted at a small aperture . The diagram illustrates successive wavefront. After what time will some portion of the wavefront XY reach P ?

`(3lambda)/(2c)`

`(2lambda)/(c)`

`(3lambda)/(c)`

`(4lambda)/(c)`

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Plane parallel wavefornts encounter the interference one medium and another as shown below The wave speed is different in the two media. what will happen to the distance between wavefront and the direction of travel wavefronts as the waves enter the second media?

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)

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