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Huygens’ idea of secondary wavelets is applied to explain which of the following?

1. It helps in determining the focal length of a thick lens
2. It provides a geometrical construction for locating a wavefront
3. It is employed to measure the speed of light
4. It is used to account for polarisation

Correct answer: It provides a geometrical construction for locating a wavefront

Solution

Huygens' secondary-wavelet principle provides a geometrical construction for locating the new position of a wavefront, from which laws of reflection and refraction follow.

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