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What is the shape of the wavefront in each case
i) light diverging from a point source.
ii) light emerging out of a convex lens when a point source is placed at its focus?Asked by dipankar 4 months ago
Answers (1)
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The wave front from a point source is spherical. The picture below shows the shape.
The wave front from a ray emerging from a point source placed in front of a convex lens is a grid of lines perpendicular to the axis of the lens as shown:
The vertical lines above are wave fronts. This is because all rays emerging from the focus of a convex lens become parallel to its axis after refraction. The wavefronts are naturally perpendicular to the rays.