When light travels from air to water and from water to glass, again from glass to \[C{{O}_{2}}\] gas and finally through air. The relation between their refractive indices will be given by

• A.            \[_{a}{{n}_{w}}\times {{\,}_{w}}{{n}_{gl}}\times {{\,}_{gl}}{{n}_{gas}}\times {{\,}_{gas}}{{n}_{a}}=1\]
• B.            \[_{a}{{n}_{w}}\times {{\,}_{w}}{{n}_{gl}}\times {{\,}_{gas}}{{n}_{gl}}\times {{\,}_{gl}}{{n}_{a}}=1\]
• C.            \[_{a}{{n}_{w}}\,\times {{\,}_{w}}{{n}_{gl}}\,\times {{\,}_{gl}}{{n}_{gas}}=1\]
• D.            There is no such relation