chapter 10 - optics terms Flashcards
physics
electric discharge
light emitted from heated gas or vapor
incandescence
light being emitted because of high temperature
Luminescence
emission of light from an object that hasn’t been heated
fluroescence
light after being exposed to ultraviolet light and continues to shine without
chiluminescence
light being emitted by chemical reaction
bioluminescence
light produced by living organisms through chemical reactions
transparent material
light is transmitted
transient material
transmitted only some light- some is reflected and some is absorbed
opaque material
no light is transmitted
three behaviors of light
transmitted, reflected, absorbed,
Fermat’s principle
light follows the path that takes the least time: travels in straight lines until it strikes an object
types of reflection
specular and diffuse
incident ray
the incoming light ray
reflected ray
the light ray that bounces off a reflective surface
normal
an imaginary line drawn perpendicular (90) to the mirror surface
law of reflection
the angle of incidence equals the angle of reflection where both angles are measured from the normal of the surface
regular/specular reflection
incedent rays are reflected back parallel
a clear image is formed
plane mirror
flat
concave mirror
curves inwards
convex mirror
curves outwards
phosphorescence
energy absorbed after exposure to light
glowsticks
umbra
dark region on a sharp shadow
formed when most of the light is blocked by the object
prenumbra
light region on a fuzzy shadow
formed when light is only partially blocked by the object
