normal
Through measuring and observing
That depends what aspect of the glass of water you want to measure: its height, its volume, its mass, its index of refraction, etc.
Ruler, scales (kitchen), scales (bathroom), measuring jug (kitchen)
it is the scale to find the mass of a thing even liquid and solid
measuring the heavy isotopes corresponding to sources of pollution measuring leaf and needle growth
normal
normal
normal.
It's called the normal.
law of reflection to test the alignment of the cylindrical lens
The reference line is the normal (perpendicular) to the surface.
The reference line is the normal (perpendicular) to the surface.
When talking about reflection (normally with light), one works out the angle of incidence and the angle of reflection by drawing a line that is perpendicular (90 degrees) to the reflector and measuring the angle between this line and the ray of incidence/reflection. This line is called the normal line. It is easier to measure the angles of incidence and reflection on a flat surface, because it is easier to draw an accurate normal line.
Totalstation
Clarity of a diamond is an ANSII standardized procedure that involves placing a light near the diamond and measuring the refraction.
it describes that how much a wave refracted through a medium or by a medium..... through it we can decide that how much and at what point we will get it's intensity..
prevent trapping of air bubbles line of sight must be perpendicular to get the correct reading and avoid errors