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  4. A plane wave passes through a convex lens. The geometrical shape of the wavefront that emerges is

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Q. A plane wave passes through a convex lens. The geometrical shape of the wavefront that emerges is

Wave Optics

Solution:

A convex lens is a converging lens. As the wave passes through the lens, they get converged towards the focus. So, the wavefront will be of the shape of converging spherical surfaces as the wave is refracted from the lens.