Light Flashcards
When Light hits an opaque object what happens?
Some light is absobred; rest reflects off
If object is transparent what happens to light?
Light rays passes through easily
if object is transluscent what happens to light
some light passes through but rest will be reflected off
T or F
Angle of reflection = Angle of incidencd
T
a line perpendicular to the surface at the point of incidence and reflection
Normal
angle that ray of light meeting a surface makes with a normal to the surface at point of incidence
Angle of Incidence
Angle that a ray of light reflected from a surface makes with a normal to the surface at the point of reflection
Angle of reflection
light rays travel in straight lines, radiating out from the light source
read
If rays are blocked by an opaque object a shadow forms where the light cannot reach
read
If the light source is moved closer to the object more light is blocked and a larger shadow is formed
read
Light travels in ______ from the light source
Straight Lines
Light coming from, or reflecting off objects enters the eye through the cornea then the pupil
It is focused clearly by the lens on the retina
Light sensitive cells of the retina gather info about patterns of light and dark , color and movement and send it through the optic nerve
Read
Information entering the brain through the optic nerve is then transmitted through more nerve pathways to the visual cortex
Here the patterns of light and dark color and movement are interpreted
the brain based on past experience can then understand what it sees
read
light looks White = all colors of spectrum (rainbow)
read
turning back of a wave upon hitting on object
Reflection
turning back of light into the same medium after striking a surfsce
reflection of light
reflection of light can be further analyzed by treating it as a ________
particle
path traveled by the particles of light
ray
Smooth surface
regular/ specular reflection
rough surfaces
Diffused Reflection
any surface that is smooth enough to produce regular reflection of light incident upon it
Mirrors
Formed in front of the mirror through the actual intersection of reflected light rays
can be projected on a screen
always inverted
real image
formed at the back of the mirror by extending the reflected rays
cannot be focused on screen
always upright
Virtual Image
Real Image
concave mirrors
virtual Image
Convex mirrors
images formed by plane mirrors are always virtual
object and image have the same size
plane mirror images
distance of the object from the front of the mirror is equal to the distancr of the image from the back of the mirror
image is laterally reversed
Plane mirror images
