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Question

Huygen's concept of secondary wave

A
allows us to find the focal length of a thick lens
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B
is a geometrical method to find a wavefront
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C
is used to determine the velocity of light
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D
is used to explain polarization
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Solution

The correct option is C is a geometrical method to find a wavefront
Huygen's principle: Every point on a wave-front may be considered a source of secondary spherical wavelets which spread out in the forward direction at the speed of light. The new wave-front is the tangential surface to all of these secondary wavelets.

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