transfer information from one place to another.
Electromagnetic wave. Sound wave.
Distance from peak to middle or to trough.
Number of waves passing a point per second.
C= frequency times wavelength.
Reflection is an image in a mirror based on the reflection of light.
The normal is a straight line drawn between the incident ray and the mirror.
The angle that goes towards the mirror.
The angle of incidence is alway equal to the angle of reflection