$A$ light ray undergoes refraction from air to water,water to glass,and finally from glass back to air. If the emergent ray is parallel to the incident ray,which of the following relations is correct? ($n_{a}, n_{w}, n_{g}$ represent the refractive indices of air,water,and glass respectively.)
- A$_{g}n_{w} = \frac{_{a}n_{g}}{_{a}n_{w}}$
- B$_{g}n_{w} = _{a}n_{g} \times _{a}n_{w}$
- C$_{w}n_{g} = \frac{_{a}n_{w}}{_{a}n_{g}}$
- D$_{w}n_{g} = \frac{_{a}n_{g}}{_{a}n_{w}}$
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