Define the term 'wavefront of light'. A plane wave front AB propagating from denser medium (1) into a rarer medium (2) is incident on the surface P_(1)P_(2) separating the two media as shown in figure. Using Huygen's principle, draw the secondary wavelets and obtain the refracted wavefront in the diagram.

Define the term 'wavefront of light'. A plane wave front AB propagatin

1.	Define the term 'wavefront of light'. A plane wave front AB propagating from denser medium (1) into a rarer medium (2) is incident on the surface P_(1)P_(2) separating the two media as shown in figure. Using Huygen's principle, draw the secondary wavelets and obtain the refracted wavefront in the diagram.
Answer» Solution :Awavefront is defined as a surface of constant PHASE. Alternately, a wavefront is the CONTINUOUS locus of all those POINTS which are in same phase at any instant of time. SECONDARY WAVELETS and the refracted wavefront is shown in the following diagram.

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