It has infinite length and zero measure in any other direction.
yes they do, to measure and calculate how much paint they need, they also use maths to estimate something
you have to measure how much medicine you are going to give a patient
The measure of how much a ray of light bends when it enters a material is known as the refractive index. This property determines how much light is slowed down and redirected as it passes through the material, affecting phenomena such as reflection and the formation of images. Different materials have different refractive indices, which influences their optical behavior.
a ray in maths is a arm of an angle.
mm
In maths, a ray.
ray rad[ian]
Index of refraction
The measure of how much a ray of light bends when it enters a material is known as the refractive index of that material. It quantifies how much the speed of light changes as it moves from one medium to another, affecting the angle at which light is bent or refracted. Each material has its own specific refractive index, influencing how much light is refracted as it passes through.
cm
Index of Refraction
Ml is mili litre in maths. It is used to measure the quantity of a liquid. For eg , there is 100ml of water in this glass.