Law of reflection for a plane wave can be explained using

Question

Question

Answer 1

CONCEPT:

Huygen's Principle Definition: Every point on a wavefront is a source of wavelets. These wavelets spread out in the forward direction, at the same speed as the source wave. The new wavefront is a line tangent to all of the wavelets.

F1 J.K Madhu 28.05.20 D10

Huygen’s Reflection: The tangent to these wavelets shows that the new wavefront has been reflected at an angle equal to the incident angle.
This is known as the law of reflection

i.e., angle of incidence = angle of reflection

The direction of propagation is perpendicular to the wavefront, as shown by the downward-pointing arrows.

F1 J.K Madhu 28.05.20 D12

Explanation:

From the above equation, we can see that according to Huygen's principle for reflection of the plain waves the law of reflection can be expressed as

the angle of incidence = angle of reflection

Hence option 4 is correct among all

Additional Information

Theory	Used for
Maxwell equation for EM waves	Established relation between electricity and magnetism
Newton corpuscular theory	Explained particle nature of light
Snell's Law	Used to explain law of refraction for plain wavefront
Huygen's principle	Law of reflection for plain wavefront