The figure shows a surface XY separating two transparent media, med...

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The figure shows a surface XY separating two transparent media, medium-1 and medium-2. The lines \( \mathrm{ab} \) and cd represent wavefronts of a light wave traveling in medium-1 and incident on \( \mathrm{XY} \). The lines ef
\( \mathrm{P} \) and gh represent wavefronts of the light wave in medium- 2 after refraction.

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The phases of the light wave at c, d, e and f are \( \phi_{\mathrm{c}}, \phi_{\mathrm{d}}, \phi_{\mathrm{e}} \) and \( \phi_{\mathrm{f}} \) respectively. It is given that \( \phi_{\mathrm{c}} \neq \phi_{\mathrm{f}} \).
(A) \( \phi_{\mathrm{c}} \) cannot be equal to \( \phi_{\mathrm{d}} \)
(B) \( \phi_{\mathrm{d}} \) can be equal to \( \phi_{\mathrm{e}} \)
(C) \( \left(\phi_{\mathrm{d}}-\phi_{\mathrm{f}}\right) \) is equal to \( \left(\phi_{\mathrm{c}}-\phi_{\mathrm{e}}\right) \)
(D) \( \left(\phi_{\mathrm{d}}-\phi_{\mathrm{c}}\right) \) is not equal to \( \left(\phi_{\mathrm{f}}-\phi_{\mathrm{e}}\right) \)
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