Flashcards in Lecture 14 Deck (73)
___________ is responsible for producing iridescent coloring.
• White light hits the surface at an angle and is partially _______
Some light enters the wax/covering and is _______, then
_______ by the boundary at the bottom wax layer, and _________
again as it exits the layer
refracted, reflected, refracted
In birds, why do some appear to be very shimmery and color changing?
Primary and secondary
reflections will be in phase
for certain colors and out
of phase for others
resulting in the
appearance of very
shimmery changing colors
What are iridescent feathers?
coloring is produced by the
structure of the feathers
• … • Damage to feather structure
results in decrease of iridescence
• Small particles with a different________ ______ from the general
medium can cause some wavelengths to scatter
What causes light scattering in animals.?
Animal’s surface is coated with transparent material that contains
a matrix of tiny dense particles considerably smaller than 300 nm
• Underneath this surface is a layer of melanin
Tiny air pockets in the bards of feathers causes what?
scattering of incoming light, resulting in a specific non iridescent color.
Blue is always produced in this manner.
Placing a thin yellow carotenoid layer above this
arrangement, violet and blue wavelengths are
absorbed and _______ is the only wavelength
How is white coloring made?
produced by scattering particles that
are larger than wavelengths of light
(resulting in multiple wavelengths
being reflected = white)
T/F: Pigment, scattering and interference produced coloring cannot be changed quickly
What is the purpose of badges?
used to communicate
information and are very noticeable