CBSE Class 10 Answered

Refractive index of medium A with respect to medium B = speed of light in B/speed of light in A

Refractive index of medium A with respect to Air = μ_A = speed of light in Air/speed of light in A

Combining these two we can write,

 μ_B /μ_A = V_B/V_A

(1) Hence the media pairs will be water to crown glass, water to rock, and so on as water pairs up with each medium. Then crown glass to each other medium except water.

(2) Diamond to ruby or rock salt and so on upto water. Again Ruby to every other medium except diamond and so on for remaining media.

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