Huygen's principle & wave fronts

Is Huygen's principle valid for longitudinal sound waves?

Huygen.s principle is used

List - I List -II a) spherical wave front e) location of new wave front b) plane wave front f) line source c) cylindrical wave front g) point source at finite distance d) Huygen's principle h) point source at infinite distance

(a) State Huygen's principle . Using this principle draw a diagram to show how a plane wave front incident at the interface of the media gets refracted when it propagates from a rarer to a denser medium. Hence verify Snell's law of refraction. (b) When monochromatic light travels from a rarer to a denser medium, explain the following, giving reasons- (i) Is the frequency of reflected and refracted light same as the frequency of incident light? (ii) Does the decrease in speed imply a reduction in the energy carried by light wave?

Use Huygen's principle to show how a plane wavefront propagates from a denser to rarer medium. Hence verift snell's law of refreaction.

Huygen's principle of secondary wavelets may be used to find the velocity of light in vacuum explain the particle behaviour of light find the new position of wavefront explain Snell's law

(a) Define a wavefront. Using Huygen's principle, verify the laws of reflection at a plane surface . (b) In a single slit diffraction experiment the wildth of the slit is made double the orignal width. How does this affect the size and intensity of the central diffraction band ? Explain. (c) When a tiny circular obstacle in placed in the path of light from a distance source, a bright spot is seen at the centre of the obstacle . Explain why.

Answer the following: (a) Define wavefront. Use Huygens' principle to verify the laws of refraction. (b) How is linearly polarised light obtained by the process of scattering of light? Find the Brewster angle for air-glass interface, when the refractive index of glass is 1.5 .

Use Huygens's principle to explain the formation of diffraction pattern due to a single slit illuminated by a monochromatic source of light. When the width of the slit is made double the original width, how would this affect the size and intensity of the central diffraction band ?

Huygen's principle is applicable to