The speed of light changes as it passes from one medium to the next. in which image does the speed of light changes the most

Figure 3 will have maximum change in speed

Explanation:

Speed of light in two medium is related to the refractive index of the medium

It is given by the formula

here

c = speed of light in air or vacuum

v = speed of light in the given medium

So here if the light moves from medium 1 to medium 2 then in that case the change in the path of the light is maximum will show maximum deviation.

And if the deviation in the path of light is maximum then it will show that refractive index will be maximum.

So in that case the change in the speed will be more

So in overall conclusion we can say that if light will bend more while moving from medium 1 to medium 2 then in that case the refractive index will will more and hence the change in speed will be more.