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Wavefronts of Light

Huygen's conc...

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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