MHT CET 2024 Physics question

When wavefronts pass from denser medium to rarer medium, the width of the wave front

(A)increases
(B)may increase or decrease
(C)decreasesCorrect
(D)remains unchanged

Answer: (C)

Solution

Consider a plane wavefront incident obliquely on a plane boundary. If the part of the boundary covered by the beam has length , the width of the incident wavefront is and the width of the refracted wavefront is , so $ = {

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Question ID VK-093046