Ch 1 Flashcards
The wave-particle duality
Light acts both as a wave and a particle
Spectrum of radiation
The distribution of energy among its various frequency components
Metamerism
The phenomenon that different combinations of wavelengths can produce exactly the same perceived color
Radiometry
The study of the energy transported transported by electromagnetic radiation as determined by a wideband (non-wavelength-discriminating) detector
Photometry
Determining the strength of a light source or light field using the (wavelength-discriminating) human eye
Radiant energy (Q_e in J)
The total energy radiated by a light source in a given amount of time (emitted meaning radiated, scattered, and reflected)
Radiant flux/Radient power/Luminosity (capital phi_e/L)
Power emitted by a light source at a given t
capital phi_e = dQ_e/dT
Radient energy density (w_e) in J/m^3
The energy per unit volume contained in a light field at some location in space
w_e = dQ_e/dV
Radient exitance (M_e) in W/m^2
The power emitted by a source per unit source area
M_e = d(capital phi)_e / dA
Irradiance/Intensity (E_e/I) in W/m^2
The power incident on a surface per unit revcieving area
E_e = d(capital phi)_e/ dA
I = d(capital phi)_e/ dA
Radient intensity of a point source in a particular direction (I_e) in W/sr
The radient flux emitted per unit solid angle by the source in that direction
I_e = d( capital phi)_e/d(capital omega)
Radience/Brightness (L_e)
The raidnet intensity per unit projected area perpendicular to the direction of o (true for both light observed by someone at a distance and for light emitted in a particular direction)
L_e = d^2(capital phi)_e/d(capital omega)dAcos (theta)
The raidence of a light source determined by and observer (the observed brightness of a light source)
The power emitted per unit solid angle, defined by the source, per unit projected area of the detector. Theta is the angle between the viewing direction and the normal to the area of the direction
The radience of a light source in a particular direction (emitted brightness of a source in that direction)
The power emitted per unit solid angle, defined by the area of a detector located at the appropriate viewing angle, per unit projected area of the source. Theta is the angle between the viewing direction and the normal to there surface s l
Lambertian surface
An emitting surface that is independent of viewing angle
Energy of a photon
E = hv (where v is frequency and h is Planks constant)
Wavelength
Lambda = h/p (where p is the momentum of the particle)
Relation of a particles total energy to its momentum
E^2 = c^2p^2 + m^2c^4
Wave speed in vacuum c
c = vlambda
Lambert’s cosine law
I(theta) = I(0)cos(theta)
