Optical Properties
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what are transparent, translucent and opaque materials, respectively?
transparent: see through translucent: let light through opaque: doesn’t let any light through
what are optical properties?
a materials response to exposure to electromagnetic radiation especially to visible light
what are the 2 things light can behave as?
a particle or a wave
what is a photon
a quantum unit of light
what do the variable “E”, “v”, “h” and “c” represent respectively
energy of a photon, frequency, planck’s constant, speed of light in a vaccum
radiations are packets of energy known as what?
photons
if light is transmitted, what will happen to the electron cloud?
the cloud will distort in shape
which is greater, the velocity of light in a material or vacuum
vacuum
if we add large ions to glass, what happen to the speed of light through the glass
it will decrease
if phi(0)>phi(c), what is the case
light is totally internally reflected
how do you determine the critical angle
its when phi(2) is 90deg
why are fiber optic materials cladded in low n material
so that the light will be totally internally reflected
what can be said about the size of the distance between energy states in metals
its very small
what does the small size of the energy gap in metals mean in terms of absorption
it means almost any frequency of light can be absorbed by metals
true or false, almost all light coming into a metal is absorbed within 0.1 micrometers of the surface
true
what types of materials can electrons be absorbed by
metals and small band gap materials
what types of materials can nuclei be absorbed by
all
what is the energy lost in absorbtion light by metals lost as?
the remaining energy is lost as phonons
why are metals reflective
because the energy lost by a descending electron is the same as the incident one
when an electron transitions from excited state, what is emitted
a photon
what does the color of reflected light depend on
the wavelength
true or false, metals are more transparent to very high energy radiation, like X-rays and gamma-rays
true
what can be said about an amorphous polymer in terms of scattering of light
very little to no scattering
If a polymer is transparent, what can be said about its strucutre
it will be an amorphous polymer