Question

using hugynes construction draw a figure showing propogation of plane wave reflecting at the interface of a mirror verify law of reflection
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Answer 1

Answer:

Wave front: A wave front is a locus of particles of medium all vibrating in the same phase.

Law of Reflection: Let XY be a reflecting surface at which a wave front is being incident obliquely. Let v be the speed of the wave front and at time t = 0, the wave front touches the surface XY at A.

After time t, the point B of wave front reaches the point B' of the surface.

According to Huygen's principle each point of wavefront acts as a source of secondary waves.

When the point A of wavefront strikes the reflecting surface, then due to presence of reflecting surface, it cannot advance further; but the secondary wavelet originating from point A begins to spread in all directions in the first medium with speed v.

Answer 2

Explanation:

$<font color= skyblue>$.... ▪️According to hygen principle :-

According to Huygen’s principle each point of wavefront acts as a source of secondary waves. When the point A of wavefront strikes the reflecting surface, then due to presence of reflecting surface, it cannot advance further; but the secondary wavelet originating

point A begins to spread in all directions in the first medium with speed v. As the wavefront AB advances further, its points A1, A2, A3 ... etc. strike the reflecting surface successively and send spherical secondary wavelets in the first medium.