Light and Optical Systems Flashcards
name the 2 types of light
natural (sun, fire, bioluminescent)
artificial (LED, fluorescent, incandescent, phosphorescenct, chemiluminescent
ray model of light
(an explanation based on observation of how light behaves)
light travels in straight lines
a “ray” is a straight line that represents the path of a beam of light
law of reflection
the angle of incident is the same as the angle of reflection and same with the incident ray and reflection ray
angle of incidence = angle of reflection
Two characteristics that make telescopes useful for observing the skies are their ability to:
a) separate and magnify light
b) magnify and collect light
c) collect and separate light
d) magnify and clarify light
b) magnify and collect light
The difference between a convex lens and a concave lens is:
a) convex lenses are thicker in the middle
b) concave lenses are thicker in the middle
c) convex lenses spread out light rays
d) concave lenses concentrate the light
a) convex lenses are thicker in the middle
plane mirror
reflection
same size, same distance, virtual image
A plane mirror has a(n):
a) curved surface
b) focal point
c) ability to bend light
d) flat surface
d) flat surface
A concave mirror reflects rays so that they:
a) converge to focal point
b) diverge and spread out
c) reflect and converge to a focal point
d) reflect and diverge or spread out
c) reflect and converge to a focal point
name the 5 sources of light
fluorescent
incandescent
phosphorescent
chemiluminescent
bioluminescent
fluorescent light?
UV radiation
coating glows and produces light
more expensive and difficult to dispose of
phosphor coating and mercury vapor are toxic
ultraviolet light energy –> energy absorbed by particles –> visible light energy
incandescent light?
So hot it glows
(candle, light bulb)
electrical energy –> thermal energy –> visible light energy
phosphorescent light?
radiation
(inner surface of TV and computer screens)
chemiluminescent light?
chemical reactions
(glow sticks)
chemical energy –> visible light energy
bioluminescent light?
chemical reactions within animal bodies
(fungi, fireflies, fish)
LED
Light Emitting Diode
Electricity
very efficient
long lasting
expensive
Name 3 types of materials
Transparent - light passes through (air, water)
Translucent - some rays bounce back and some go through (paper)
Opaque - materials that totally block the light and cast shadows (books, desk)
luminous
produces (or emits) light
convex mirrors
convex: (lens curves outward)
small / far away
reflects rays so that they reflect and diverge or spread out
car mirror/securit
concave mirrors
concave: (lens curves inward)
big or upside down
(makeup mirror)