Question

*Huygen's principle of secondary waves is used to:*

1️⃣ Obtain new position of wavefront geometrically
2️⃣ Explain principle of superposition of waves
3️⃣ Explain interference phenomena
4️⃣ Explain polarisation​

Answer 1

1)Obtain new position of wavefront geometrically

Answer 2

Huygen's principle of secondary waves is used to obtain new position of wavefront geometrically.

• The Theory of Huygens declares that any point on a wavefront is an origin of secondary wavelets that propagate at the same speed forward.  
• These secondary waves propagate outward, in the forward direction, and the new wavefront is made up of a similar tangent to all these advancing waves.
• It therefore allows the wavefront location to be identified.