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प्रश्न
What are Secondary sources? State Huygens’ Principle.
उत्तर
Secondary sources are those sources that do not produce light of their own but receive light from some other source and either reflect or scatter it around.
Examples: the moon, the planets, objects.
Statement of Huygens’ principle: Each point on a wavefront acts as a secondary source of light emitting secondary light waves called wavelets in all directions which travel with the speed of light in the medium. The new wavefront can be obtained by taking the envelope of these secondary wavelets travelling in the forward direction and is thus, the envelope of the secondary wavelets in forwarding direction. The wavelets travelling in the backward direction are ineffective.
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संबंधित प्रश्न
What are primary and secondary sources of light?
What is wavefront? How is it related to rays of light? What is the shape of the wavefront at a point far away from the source of light?
Derive the laws of reflection of light using Huygens’ principle.
Answer in brief:
Explain what is meant by polarization and derive Malus’ law.
Monochromatic light of wavelength λ is incident on the plane reflecting surface. After reflection, its wavelength will be ______
Wavefront is the locus of all points, where the particles of the medium vibrate with the same ____________.
A plane wavefront is an incident on a water surface at an angle of incidence 60° then it gets refracted at 45°. The ratio of the width of incident wavefront to that of refracted wavefront will be ______
`[sin pi/4 = cos pi/4 = 1/sqrt2, sin60^circ = sqrt3/2, cos60^circ = 1/2]`
In Huygens' wave theory, the locus of all points in the same state of vibration is called ______.
The direction of wavefront of a wave with the wave motion is ______.
Explain the construction and propagation of a spherical wavefront using Huygens's principle.
State laws of reflection.
Wave normals to spherical wavefronts can be ______.
What Types of wavefront?
