Lakhmir Singh and Manjit Kaur Solutions for Chapter: Refraction of Light, Exercise 7: Short Answer Type Questions

The speed of light in vacuum and in two different glasses is given in the table below:

Calculate the relative refractive index for light going from crown glass to flint glass.

The speed of light in air is $3\times {10}^8 \mathrm{m}/\mathrm{s}$. In medium $X$ its speed is $2\times {10}^8 \mathrm{m}/\mathrm{s}$ and in medium $Y$ the speed of light is $2.5\times {10}^8 \mathrm{m}/\mathrm{s}$. Calculate: ${}_{\mathrm{air} }{n}_X$

The speed of light in air is $3\times {10}^8 \mathrm{m}/\mathrm{s}$. In medium $X$ its speed is $2\times {10}^8 \mathrm{m}/\mathrm{s}$ and in medium $Y$ the speed of light is $2.5\times {10}^8 \mathrm{m}/\mathrm{s}$. Calculate: ${}_{\mathrm{air}}{n}_Y$

The speed of light in air is $3\times {10}^8 \mathrm{m}/\mathrm{s}$. In medium $X$ its speed is $2\times {10}^8 \mathrm{m}/\mathrm{s}$ and in medium $Y$ the speed of light is $2.5\times {10}^8 \mathrm{m}/\mathrm{s}$. Calculate: ${}_{X }{n}_Y$

What is the speed of light in a medium of refractive index $\frac{6}{5}$ if its speed in air is $3,00,000 \mathrm{km}/\mathrm{s}$?

The refractive index of glass is $1.5$. Calculate the speed of light in glass. The speed of light in air is $3.0\times {10}^8 {\mathrm{ms}}^{-1}$.

The speed of light in water is $2.25\times {10}^8 \mathrm{m}/\mathrm{s}$. If the speed of light in vacuum be $3\times {10}^8 \mathrm{m}/\mathrm{s}$, calculate the refractive index of water.

Light enters from air into diamond which has a refractive index of $2.42$. Calculate the speed of light in diamond. The speed of light in air is $3.0\times {10}^8 {\mathrm{ms}}^{-1}$.