Question

Define a wavefront. An incident plane wave falls on a convex lens and gets refracted through it. Draw a diagram to show the incident and refracted wavefront.

Hint:

Wavefronts change shape according to Huygens’ principle when passing through optical elements like lenses.

Answer 1

Definition of a Wavefront:
A wavefront is a surface of constant phase representing the positions of points in a wave that oscillate in unison. Refraction through a Convex Lens:
A plane wavefront incident on a convex lens converges after refraction.
The refracted wavefront is spherical and converges towards the focal point of the lens.