Ray Optics and Optical Instruments

Question: 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

1) $_{a}{{n}_{w}}\times {{\,}_{w}}{{n}_{gl}}\times {{\,}_{gl}}{{n}_{gas}}\times {{\,}_{gas}}{{n}_{a}}=1$

2) $_{a}{{n}_{w}}\times {{\,}_{w}}{{n}_{gl}}\times {{\,}_{gas}}{{n}_{gl}}\times {{\,}_{gl}}{{n}_{a}}=1$

3) $_{a}{{n}_{w}}\,\times {{\,}_{w}}{{n}_{gl}}\,\times {{\,}_{gl}}{{n}_{gas}}=1$

4) There is no such relation

Solution:

Explanation: No Explanation

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