1.

What is the ratio of sini and sinr in terms of velocities in the given figurVelocityVHIVelocity v2

Answer»

sini = v1t/ACsinr = v2t/ACthus refractive indexnunu= sini/sinr = v1/v2*Huygens principle: Every point on a wavefront acts as a source of secondary wavelets. The geometric envelope of the waves gives the shape of the wavefront at a later time.



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