Скачать или смотреть Reflection of Plane wave at plane surface NCERT Class 12 Wave Optics Chapter 10.3.3

Using Huygens principle, show that the angle of incidence is equal to angle of reflection during a plane wave front reflected by a plane surface.

Reflection of Plane wave at plane surface NCERT Class 12 Wave Optics Chapter 10

What are Laws of Reflection Based On Huygens’ Wave Theory in Class 12 Notes Wave Optics?
In the above figure, wavefront AB is an incident on the plane that reflects surface XY. Here both the reflecting surface and wavefront are perpendicular to the plane. A wavefront passes from the reflecting body at B and then at towards C.

In Huygens’ principle, at point BC, secondary wavelets start increasing with the speed c. Disturbance from A reaches point C during the time at the secondary wavelets from B.

Here, we see B has spread over a radius hemisphere that gives BD = AC = ct. Here t is the time taken by the disturbance to travel from A to C. The digression plane CD drawn from point C over this radius hemisphere ct becomes new reflected wavefront. It is where the angle of incidence is equal to the angle of reflection. This finally gives the first law of reflection.

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