In 1678, the Dutch natural philosopher Christiaan Huygens claimed to have disproved Newton’s theory by showing that the laws of reflection and refraction can be derived from his wave theory of light. POLARIZATION AND HUYGEN’S THEORY OF DOUBLE REFRACTION Anuroop Ashok Ist Yr. B Tech 2. plane of the paper. Huygens’s principle works for all types of waves, including water waves, sound waves, and light waves.

HUYGEN’S THEORY OF DOUBLE REFRACTION • According to Huygen’s theory , a point in a doubly refracting or birefringent crystal produces 2 types of wavefronts: The wavefront corresponding to the O-ray Spherical wavefront oThe ordinary wave travels with same velocity in all directions and so the corresponding wavefront is spherical. later. Explanations for each of … This is an example of Fermat’s Principle of Least Action. Let v 1 and v 2 be the velocity of incident and reflected ray respectively such that (v 1 > v 2).At first, the wavefront A hits the surface PQ and then C reaches and hits at the last. POLARIZATION OF LIGHT - BIREFRINGENCE AND HUYGEN'S THEORY OF DOUBLE REFRACTION 1. As discussed earlier, when light is incident on the surface it is re- … 3.4 Huygens’ wave theory. Let us consider a plane wavefront AB incident on surface PQ. I am not sure that this is an explanation of why reflection and refraction happen the way they do as much as an interesting description of what happens in nature. This interactive Java tutorial is designed to illustrate the reflection and refraction of light according to the multiple wavelet concept, now known as the Huygens' principle.

Refraction using Huygen’s principle. Snell's law is the scientific law of the refraction of light or other waves.In optics, Snell's law is about the speed of light in different media. In addition, we will see that Huygens’s principle tells us how and where light rays interfere. The tutorial initializes with an incident wavefront of light propagating through a medium ( Medium 1 ) at angle of 45 degrees towards second a medium ( Medium 2 ) that possesses a different refractive index than the first. We know that when a light travels from one transparent medium to another transparent medium its path changes. Laws of Refraction on the Basis of Huygens’s Wave Theory. In both cases, reflection and refraction, the route taken is such that the time taken is least. Thus the phenomenon of refraction is explained on the basis of the Huygens’ wave theory of light. Crystals belonging to the hexagonal, tetragonal, or rhombohedral classes are uniaxial, in that they possess a unique optical axis, most often coincident with the crystallographic axis. Also the incident wavefront, the refracted wavefront and the normal lie in the same plane. Explanations of each of … At an instant, the wavelet to reach A’ from B, then BA’ = ct. During this time, the secondary if t is the time taken by the secondary wavelet originating at A has traveled a distance vt = AB’ in the denser medium. - Ignored the wavefront formed by the back half of the wavelets Despite weaknesses in his model, Huygens was able to apply his principle to prove the laws of reflection and refraction (as shown in the next sections.)

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.