Question:
The wave theory of light was given by
The wave theory of light was given by
Updated On: Jun 6, 2024
- Maxwell
- Planck
- Huygen
- Young
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The Correct Option is C
Solution and Explanation
In 1678 Huygen proposed the wave theory of light. According to Huygen, light travels in the form of waves. These waves after emerging from the light source travel in all directions with the velocity of light. Since, waves require a medium to travel Huygen proposed an all pervading medium ether.
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Concepts Used:
Huygen's Principle
The principle that states, that each point of the wavefront is the source of the secondary wavelets, it spreads out in all directions with the speed of a wave is the Huygens Principle. According to Huygens’ principle, as the wavefronts will be in the forward direction, all the points on the wavefront will become a secondary source. All the secondary sources emit wavelets and tangents and are drawn to all the wavelets which is the new position of the waveform.
Over and above that Huygen’s Principle, is known as the Huygens–Fresnel Principle. These are the following features of wave propagation:
- Every secondary source forms its own wavelets which are akin to the primary source.
- Randomly, at any point, the tangents in the forward direction form a new wavefront.
- The total of all the spherical wavelets is the wavefront.
Advantages and Disadvantages of the Huygens Principle:
Advantages:
- The reflection and refraction of light are also proved with the help of Huygens' concept.
- The concepts like diffraction of light, as well as interference of light, were also proved by Huygens'.
Disadvantage:
- Huygens's principle has not discussed or proved the concepts like emission of light, absorption of light, and the polarization of light.
- Huygens' principle fails the explanation of the photoelectric effect.
- A serious drawback is that the theory advances an all-pervading medium required to propagate light called luminiferous ether. This was proved to be false in the twentieth (20th) century.