In problem 2, what is the refractive index of medium 1 w.r.t. medium 2 ?

Explanation

Here, `.^(2)n_(1) = ?`
`.^(2)n_(1) = 1/(.^(2)n_(1))`,
`.^(2)n_(1) = 1/(sqrt2) = (sqrt2)/(sqrt(2).sqrt(2)) = (1.414)/2 = 0.707`