The figure shows a surface XY separating two transparent media, medium -1 and medium -2. The lines ab and cd represent wavefronts of a light wave travelling in medium-1 and incident on XY. The lines ef and gh represent wavefronts of the light wave in medium-2 after refraction.
The phases of the light wave at $c, d, e$ and $f$ are $\phi_c, \phi_d, \phi_e$ and $\phi_f$ respectively. It is given that $\phi_c \neq \phi_f$
Select the correct option:
A
$\phi_{\mathrm{c}}$ cannot be equal to $\phi_{\mathrm{d}}$
B
$\phi_d$ can be equal to $\phi_e$
C
( $\phi_d-\phi_f$ ) is equal to ( $\phi_c-\phi_e$ )
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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