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Q.

Huygen's conception of secondary waves 

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a

Allow us to find the focal length of a thick lens

b

Is a geometrical method to find a wavefront

c

Is used to determine the velocity of light

d

Is used to explain polarization

answer is B.

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Detailed Solution

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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