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The refractive index of glass with respect to air is 3/2. What is the refractive index of air with respect to glass?
A3/2
B1/3
C2/3
D1/2
Answer & Solution
Correct answer: C. 2/3
1. The refractive index of one medium with respect to another is the reciprocal of the reverse index.
2. Given $^{air}n_{glass} = \dfrac{3}{2}$.
3. Therefore $^{glass}n_{air} = \dfrac{1}{3/2} = \dfrac{2}{3}$.
4. The option 3/2 just repeats the given value; 1/2 and 1/3 are arithmetic traps that do not invert the fraction correctly.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 6 "Refraction of Light", p.88_
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