In the adjoining diagram, a wavefront $AB$, moving in air is incident on a plane glass surface $XY$. Its position $CD$ after refraction through a glass slab is shown also along with the normals drawn at $A$ and $D$. The refractive index of glass with respect to air ($\mu = 1$) will be equal to

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  • A

    $\frac{{\sin \theta }}{{\sin \theta '}}$

  • B

    $\frac{{\sin \theta }}{{\sin \phi '}}$

  • C

    $\frac{{\sin \phi '}}{{\sin \theta }}$

  • D

    $\frac{{AB}}{{CD}}$

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