Reflection & Refraction by Huygen's principle - Lec 11- optics

Huygen.s principle is used

According to Huygen's principle

Refraction & Reflection of Light

Huygen's principle is applicable to

Huygen's principle allows us to determine,

Define the term wave front. State Huygen's principles.

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 .

A : One of the images in double refraction doesn't obey the principles of refraction. R : Extraordinary image in double refraction doesn't obey the principles of refraction because its velocity changes with direction.

(i) Define term wavefront. State Huygen.s principle. (ii) consider a plane wavefront incident on a thin convex lens. Draw a proper diagram to show him the incident wavefront traverses throught the lens and after refraction focuses on the focal point of the lens, giving the shape of the emergent wavefront. (iii) When light travels from a rarer to a denser medium, it loses speed. Does, this loss imply a reduction in energy carried by the light waves.

State Huygens' principle of diffraction of light.