The figure
corresponds to v2 < v1 so that the refracted waves bends towards the
normal Rationalised 2023-24
259
Wave Optics
In order to determine the shape of the refracted
wavefront, we draw a sphere of radius v2t from the point
A in the second medium (the speed of the wave in the
second medium is v2) Let CE represent a tangent plane
drawn from the point C on to the sphere Then, AE = v2 t
and CE would represent the refracted wavefront