Lakhmir Singh and Manjit Kaur Solutions for Chapter: Refraction of Light, Exercise 8: Long Answer Type Questions

State and explain the laws of refraction of light with the help of a labelled diagram.

What is meant by the refractive index of a substance?

Light travels through air at $300 \mathrm{million} {\mathrm{ms}}^{-1}$. On entering water it slows down to $225 \mathrm{million} {\mathrm{ms}}^{-1}$. Calculate the refractive index of water.