Question

(i) Use Huygens’ geometrical construction to show the behaviour of a plane wavefront,(a) passing through a biconvex lens;(b) reflected by a concave mirror.(ii) When monochromatic light is incident on a surface separating two media, why does the refracted light have the same frequency as that of the incident light?

Answer 1

According to Huygens, the remainder of each wavelet is to be disregarded in the application of the principle. In so disregarding the effectiveness of the overlapping wavelets, Huygens avoided the possibility of diffraction of the light into the region of geometric shadow. Huygens also ignored the wavefront formed by the back half of the wavelets, since these wavefronts implied a light disturbance traveling in the opposite direction. Despite weaknesses in this model, remedied later by Fresnel and others, Huygens was able to apply his principle to prove the laws of both refection and refraction.

Answer 2

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