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Flashcards in Lecture 14 Deck (73)
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61

___________ is responsible for producing iridescent coloring.

Interference

62

• White light hits the surface at an angle and is partially _______

reflected

63

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

64

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

65

What are iridescent feathers?

– iridescent
coloring is produced by the
structure of the feathers
(Interference)
• … • Damage to feather structure
results in decrease of iridescence

66

• Small particles with a different________ ______ from the general
medium can cause some wavelengths to scatter

refractive index

67

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
in diameter
• Underneath this surface is a layer of melanin

68

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.

69

Placing a thin yellow carotenoid layer above this
arrangement, violet and blue wavelengths are
absorbed and _______ is the only wavelength
scattered

green

70

How is white coloring made?

produced by scattering particles that
are larger than wavelengths of light
(resulting in multiple wavelengths
being reflected = white)

71

T/F: Pigment, scattering and interference produced coloring cannot be changed quickly

True

72

What is the purpose of badges?

used to communicate
information and are very noticeable

73

Define badges.

morphological
specializations used as visual
signals
• Bright patches of skin, fur, feathers
• Horns, casques, or crests