With respect to air, the refractive index of a flint glass and alcohol is 1.65 and 1.36 respectively. Calculate the refractive index of the flint glass with respect to alcohol.
1.21
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Solution
The correct option is A 1.21 Given: Refractive index of flint glass with respect to air, nf=1.65 Refractive index of alcohol with respect to air na=1.36
Let the refractive index of flint glass with respect to alcohol be nfa.
From definition of refractive index, nfa=nfna nfa=1.651.36=1.21