A ray of light in incidentin medium 1 on a surface that separates medium 1 from medium 2 . Let `v_(1) and v_(2)` represent the velocity of light in medium 1 and medium 2 respectively . Also let `n_(12) and n_(21)` represent the refractive index of medium 1 with respect to medium 2 and refractive index of medium 2 with respect to medium 1, respectively. if 1 and r denote the angle of incidence and angle fo refraction, then -

Options

A. `(sin i)/(sin i) = n_(21) = (v_(1))/(v_(2))`
B. `(sin i)/(sin r) = n_(21)=(v_(2))/(v_(1))`
C. `(sin i)/(sin r) = n_(12) = (v_(1))/(v_(2))`
D. `(sin i)/(sin r) = n_(12) = (v_(2))/(v_(1))`

Answer

A