Practice Exercise 4C

What are the laws of refraction?

If the refractive index of glass for light going from air to glass is $3/2$, find the refractive index of air for light from glass to air. 

What is the speed of light in a transparent medium which has a refractive index of $1.7$. (The speed of light in vacuum is $3 \times {10}^8 {\mathrm{ms}}^{-1}$).

The refractive index of medium $A$ with respect to medium $B$ is $n_{AB} = 1.7$. Find $n_{BA}$.

The refractive index of medium $A$ is $1.7$ and that of $B$ is $1.2$. Find $n_{BA}$. (Answer upto one decimal point)

Monochromatic light of wavelength $500 \mathrm{nm}$ is incident from air to glass. What is the wavelength of light in glass? The refractive index of glass is $1.5$.

If the angle of incidence for a ray of light moving from air to glass is $45°$ and the angle of refraction in glass is $30°$, find the refractive index of glass.

A ray of light moves from air into a glass slab. The refractive index of glass slab is $1.5$. What is the speed of light (in $\mathrm{m} {\mathrm{s}}^{-1}$) in glass?