How is speed calculated? multiply velocity by displacement divide velocity by displacement multiply distance by time divide distance by time

Explanation:

Speed = Distance / Time

So, to find distance, we actually divide distance by rime.

Explanation:

Using the formula to calculate speed:

We divide the distance by the time taken to get the average speed.

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

a and b sometimes have a positive value