Dispersion occurs when light passes through a glass prism because of the

The property of a body to remain at rest or to continue in a uniform motion, in a straight line is called

An object placed at the bottom of a well full of clear water appears closer to the surface due to

A lamp rated $100 W$, $240 V$ is lit for $5$ hours. Calculate the cost of lighting the lamp if $1 kWh$ of electrical energy cost $₦5$.