A parallel beam of light strikes a piece of transparent glass having 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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b is the correct answer for this question
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It has given that, a parallel beam of light strikes a piece of transparent glass having cross section area as shown in figure.
we have to check : correct shape of the emergent wavefront will be..
solution : glass can be divided into three parts.
from top to below characters of glass are ; converging, diverging and converging [ see figure ]
we know, for converging, a beam of light converges in a point while for diverging , a beam of light diverges from a point.
so the situation diagram of wavefront as shown in figure ..
Therefore the correct option is (A)
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