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ICSE Class 10 Physics 2019 Paper

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Question : 13 of 74
Marks: +1, -0
If the refreactive index of water with respect to air (aμw)({}_a \mu_w) is   53\;\frac{5}{3} . Calculate the refractive index of air with respect to water (wμa)(_w \mu_a)
Solution:  
Given that: aμw=  53{}_a \mu_w = \;\frac{5}{3}
  ∵    wμa=  1aμw\;\because\;\; {}_w \mu_a = \;\frac{1}{{}_a \mu_w}
  ∴    μa=  153=  35\;\therefore\;\; \mu_a = \;\frac{1}{\frac{5}{3}} = \;\frac{3}{5}
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