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प्रश्न
Define a wavefront. Using 'Huygens' principle, draw the shape of a refracted wavefront, when a plane wave is incident on a convex lens.
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उत्तर
The locus of points, which oscillate in phase is called a wavefront; thus a wavefront is defined as a surface of constant phase.
In the given figure we consider a plane wave incident on a thin convex lens, the emerging wavefront is spherical and converges to point F which is known as the focus.
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