CH 1: The nature of light. Wave – Particle Duality. Light exhibits both wave and particle characteristics. Both characteristics are present at all times, but certain characteristics are more prevalent in certain circumstances. Particle Nature Exchanging energy with matter Compton Scattering
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Reflection is the simplest method for changing the direction of light.
Reflection – Light incident on a boundary between two mediums is absorbed and reemitted back into the original medium.
When light is reflected from a surface it takes the path of least time.
This will correspond to the path of least distance since the speed is constant.
The path of least distance requires that the angle of incident be equal to the angle of reflection.
qi – incident angle
qr – reflected angle
Law of Reflection
The angle is always measured relative to the surface normal!!
The law of reflection holds true for all electromagnetic waves. There are two main categories of reflection.
Specular reflection – light reflected off of a smooth surface. Reflected rays will all be parallel.
Smooth surface – irregularities are smaller than the wavelength of the light.
Diffuse reflection – light reflected off of a rough surface. The reflected rays are in a variety of directions