Kerala Board Solutions for Chapter: Refraction of Light, Exercise 4: Let us assess

Observe the figure. Light falling on two different media are shown.
Which medium has greater refractive index?

An object of height $3 \mathrm{cm}$ is placed in front of a convex lens of focal length $20 \mathrm{cm}$ at a distance of $30 \mathrm{cm}$. What is the distance(in $\mathrm{cm}$) to the image formed?

An object of height $3 \mathrm{cm}$ is placed in front of a convex lens of focal length $20 \mathrm{cm}$ at a distance of $30 \mathrm{cm}$. What is the nature of the image?

An object of height $3 \mathrm{cm}$ is placed in front of a convex lens of focal length $20 \mathrm{cm}$ at a distance of $30 \mathrm{cm}$. What is the height of the image in centimeter?

In the table the absolute refractive indices of certain transparent media are given.
 
Find out from the table the medium of highest and lowest optical densities.

If the speed of light in air is $3\times {10}^8 \raisebox{1ex}{$m$}\!\left/ \!\raisebox{-1ex}{$s$}\right.$, what will be the speed of light through kerosene? (Refractive index of kerosene is $1.44$)

Will a ray of light deviate towards the normal or away from the normal when it enters from air to diamond obliquely provided the refractive index of the diamond is $2.42$.

The refractive index of diamond is $2.42$. What do you mean by this? Calculate the speed of light through diamond.