Question

Huygens theory of double refraction​

Answer 1

Huygens' principle, in optics, a statement that all points of a wave front of light in a vacuum or transparent medium may be regarded as new sources of wavelets that expand in every direction at a rate depending on their velocities.

Answer 2

Answer:

Two light beams are produced when an unpolarized beam of light enters a birefringent crystal at normal incidence (but not along the optic axis). Double refraction is the name given to this phenomenon, which the Vikings first noticed in calcite

Explanation:

• The crystal is directly penetrated by one beam, which we refer to as the usual ray.

• The other ray, known as the exceptional ray, diverges and becomes displaced as it travels through the crystal. The two emerging beams' respective polarizations are orthogonal.

• Here is an illustration of a calcite crystal. The crystal allows the common ray to travel right through it. The remarkable beam creates the second line. The exceptional beam defies Schnell's law, which only applies to isotropic materials.

• A cross polarizer will make one or both of the double-refracted lines disappear when placed over the crystal. They are polarised orthogonally.

• According to the Huygens' principle, all locations along a wavefront of light in a vacuum or transparent medium can be thought of as fresh sources of wavelets that spread out in all directions at a pace dependent on their velocities.

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