Physics #1 quiz Flashcards
what is light
a form of electromagnetic radiation that can be seen by the eye.
electromagnetic radiation
waves created by the motion of electrically charged particles
speed of light
300, 000, 000 meters/second
3 x 10^8 or 300 000 km/s
different forms of electromagnetic radiation. types of light is based on wavelength. name 6 from greatest to least amount of wavelengths
-xrays
-ultraviolet
-violet light
-red light
-microwave
-radio
shortest wavelength
xrays
our eyes can detect or see objects that…
emit light or reflect light
Different types of light emission
-natural ex. sun
-artificial ex. light bulb
light from these sources are called white light because they are a mixture of different colors
bioluminescence
emission of light by a living organism through a chemical reaction
ex. jellyfish
phosphorescence
emission of light by a material after being exposed to ultraviolet radiation or other types of radiation
ex. glow in the dark items
chemiluminescence
emission of light through chemical reaction
ex. glowstick
triboluminescence
emission of light by a material that undergoes friction and/or results from breaking of certain crystals
ex. cutting gems & diamonds
incandescence
emission of light by heating a solid
ex. incandescence bulb, electric stoves, fireworks
fluorescence
the emission of light by a material while exposed to ultraviolet radiation
ex, fluorescent light bulb
reflection
the change in direction of a wave when it reaches a surface and bounces off that surface. is the bouncing back of light from any surface
light is perceived is dependent on the surface
- reflected from a smoot surface at a definite angle
2 reflected from a rough surface and reflection is diffused in different directions
geometric optics
determining the path of light rays when they strike an object
mirror
any polished surface that exhibits an image
image
reproduction of an original object that is produced through the use of light
reflection
change in direction of a wave when it reaches a surface and bounces off that surface. -bouncing back of light from any surface
transparent, translucent, opaque
transparent: glass
translucent: frosted glass
opaque: a rock
image
picture of an object produced by light. it appears when light rays from an object meet (or appear to meet)
SALT
size: smaller, larger, same
attitude: upright, upside down
location: behind, in front
type: real, virtual
image in plane mirror
-always virtual
-reflected rays forms an image on the retina at the back of their eye
-brain interprets the image as behind the mirror
-always same size, upright, behind mirror, and virtual
concave (converge) mirrors
-inner surface mirror is reflective
-ex. car headlights, makeup (magnified) mirrors, satellite dishes
convex (diverging) mirror
-outer surface of mirror is reflective
-ex. security mirrors in stores, side-view mirrors on cars
-light rays spread apart or diverge when light strikes a convex mirror
center of curvature (C)
the center point of a sphere with the same curve as the mirror
vertex
point where principal axis meets the curves mirror
principle axis (PA)
line between C and V
focus
point where the light rays coming in (parallel to the PA) meet after being reflected off the curved mirror
