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Question
The refractive index of water with respect to air is 4/3. What is the refractive index of air with respect to water?
Numerical
Solution
`""_"air"mu_"water" = 1/(""_"air"mu_"water")`
water = air
∴ `""_"water"mu_"air" = 1/(""_"air"mu_"water")`
`""_"water"mu_"air" = 1/(4/3)`
= `3/4`
= 0.75
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