Aray diagram for a refracted light ray is shown.
what does the dashed line represent?
a.) medium
b.) boundary
c.) normal
d.) incident ray
you in advance ! < 3

The answer is  a.first and third quarters 

Gas will most likely  fill the container 

The radiation of the fire causes the saucepan to heat up. the conduction of the saucepan then to distribute the heat over the saucepan and to give heat to the water. the convection of the water distributing the heat within the water, till all the water is boiling