Define wavefront. Draw the shape of refracted wavefront when the plane incident wave undergoes refraction from optically denser medium to rarer medium. Hence prove Snellβs law of refraction.Β
Answer
A locus of points in space which oscillate in the same phase is called a wavefront .Β
That is, the phase difference between any two points of the same wavefront is zero .
Let us assume an incident wavefront AB incident on an interface between 2 media with refraction indices n1>n2.
According to Huygenβs wave theory:
- A source of lightΒ gives out waves in all directions.
- Every point on the wavefront is a source of disturbance. These disturbances called secondary wavelets,Β travel in all directions.
- The time taken by secondary wavelets to travel from primary to secondary wavefront is a constant .Β
Therefore, on the basis on these statements we can say that:
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