What is the difference between incident ray and emergent ray?

Light enters from air to glass plate having $1.50$ refractive index. What is the speed of light in glass? (Given-speed of light in vacuum $3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$)

"Ray of light travels from optically rarer medium to optically denser medium, it moves towards normal and when it travels from optically denser to optically rarer medium it moves away from the normal is known as refraction of light". Which of the following pentagon figures shows the correct refraction of light.

Light enters from air to kerosene having refractive index of $1.47$. What is the speed of light in kerosene, if the speed of light in air is $3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$?

A fish seems to be at the depth of $75 \mathrm{cm}$ from the surface of a pond, then find out its actual depth from the surface. (Given-refractive index of water $\frac{4}{3}$)

In the given figure, AB is the incident ray, BC is the refracted ray and MN is the normal at the point of incidence. Which medium is more
denser? Why?