The optical path of a monochromatic light is the same if it goes through $4.0 \, cm$ of glass or $4.5 \, cm$ of water. If the refractive index of glass is $1.53$,the refractive index of water is:
- A$1.3$
- B$1.36$
- C$1.42$
- D$1.46$
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