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Refractive index of medium A with respect to medium B is given by:
An_AB = wavelength in A × wavelength in B
Bn_AB = speed in A / speed in B
Cn_AB = sin(i in A) / sin(r in A)
Dn_AB = speed in B / speed in A
Answer & Solution
Correct answer: D. n_AB = speed in B / speed in A
1. Relative refractive index of A w.r.t. B equals v_B/v_A.
2. This follows from Snell's law: n₁ sin θ₁ = n₂ sin θ₂.
3. When A is denser than B, n_AB > 1.
_Source: NCERT Class 10 Science, Ch 9 "Light Reflection and Refraction", §9.3.1_
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