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(D) When a point source of light is placed at the focus of a convex lens,the light rays originating from the source become parallel to the principal a

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Plane

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(D) When a point source of light is placed at the focus of a convex lens,the light rays originating from the source become parallel to the principal axis after refraction through the lens.Since the emerging light rays are parallel,they represent a beam of light traveling in a specific direction.$A$ wavefront is defined as the locus of all points that are in the same phase of oscillation.For a parallel beam of light,the wavefronts are planes perpendicular to the direction of propagation of light.Therefore,the shape of the wavefront of the emerging light is plane.

When a point source of light is placed at the focus of a convex lens,light emerges from the lens. What is the shape of the wavefront of the emerging light?

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