A plane wave front of light is incident on a plame mirror. Intensity is maximum at p when
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A wavefront is a surface over which an optical wave has a constant phase. For example, When a stone is dropped in a still water, waves spread out along the surface of water in all directions with same velocity. A point source of light in an isotropic medium at infinite distance will give rise to plane wavefront.
An Incident Wave Reflects and Refracts at an Interface
An incident wave (green) is represented by just two wavelets of a propagating plane wave, the plane wavefront (light green) shown as a tangent to the two wavelets. The reflected wave (blue) spreads at the same speed as the incident, being in the same medium.
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