Define the term wave front. State Huygen's principles. Consider a plane wave front incident on a thin convex lens. Draw a proper diagram to show how the incident wave front traverses through the lens and after refraction focuses on the focal point of the lens, giving the shapeof the emergent wave front.

Define the term wave front. State Huygen's principles. Consider a pla

1.	Define the term wave front. State Huygen's principles. Consider a plane wave front incident on a thin convex lens. Draw a proper diagram to show how the incident wave front traverses through the lens and after refraction focuses on the focal point of the lens, giving the shapeof the emergent wave front.
Answer» SOLUTION :A wave front is a locus of all the PARTICLES which are vibrating in the same phase. `(i)` A SOURCE sends waves in all possible directions. `(ii)` Each point of a wave front acts as a source of secondary wavelets. The envelope of all wavelets at a given instant gives the position of a new wavelets.

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