Why property of light remains unchanged when it enters the different medium

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.

Answer///air resistance,drag;

//(b) both involve the use of levers;

Answerstatic electricity shock;