(i) Define refractive index of a medium.(ii) In the following ray diag

1.	(i) Define refractive index of a medium.(ii) In the following ray diagram, calculate the speed of light in the liquid of unknown refractive index.
Answer» (i) Refractive index of a medium is the ratio of speed of light (c) in the free space to the speed of light (v) in that medium. \(μ=\frac{c}{v}\) (ii) \(μ=\frac{c}{v}=\frac{1}{sin\,i_c}\) \(\frac{3 \times 10^8}{v}=\frac{1}{\frac {30}{50}}\) \(v=\frac{30}{50}\times3\times10^8=1.8\times10^8m/s\)

(i) Define refractive index of a medium.(ii) In the following ray diagram, calculate the speed of light in the liquid of unknown refractive index.

Answer»

(i) Refractive index of a medium is the ratio of speed of light (c) in the free space to the speed of light (v) in that medium.

\(μ=\frac{c}{v}\)

(ii) \(μ=\frac{c}{v}=\frac{1}{sin\,i_c}\)

\(\frac{3 \times 10^8}{v}=\frac{1}{\frac {30}{50}}\)

\(v=\frac{30}{50}\times3\times10^8=1.8\times10^8m/s\)