Figure shows behavior of a wavefront when it passes through a prism...

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Figure shows behavior of a wavefront when it passes through a prism.
Which of the following statements are correct ?
I. Lower portion of wavefront \( \left(B^{\prime}\right) \) is delayed resulting in a tilt.

II. Time taken by light to reach \( A \) ' is equal to the time taken to reach \( B \) ' from \( B \).
III. Speed of wavefront is same everywhere.
IV. A particle on wavefront \( A^{\prime} B^{\prime} \) ' is in phase with a particle on wavefront \( A B \).
(a) I and II
(b) II and III
(c) III and IV
(d) I and III
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