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(A) The speed of light in glass is less than the speed of light in air. When a plane wavefront passes through a medium,the part of the wavefront that

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(A) The speed of light in glass is less than the speed of light in air. When a plane wavefront passes through a medium,the part of the wavefront that travels through a greater thickness of the medium is delayed more. In the given glass piece,the top and bottom parts are thicker,so the light passing through these regions travels a longer distance in glass,resulting in a greater time delay. The middle part is thinner,so the light passing through it travels a shorter distance in glass,resulting in less time delay. Consequently,the wavefront emerges with the top and bottom parts lagging behind the middle part. This results in a shape where the middle part is pushed forward (convex) and the top and bottom parts are pushed backward (concave),which corresponds to the shape shown in option $A$.

$A$ parallel beam of light strikes a piece of transparent glass having a cross-section as shown in the figure below. The correct shape of the emergent wavefront will be (figures are schematic and not drawn to scale)-

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