Transparent material
• Transparent material  allows light to
pass through it freely
Translucent material
• Translucent material  allows most
light rays through but scatters the light
Opaque material
• Opaque material  allows NO light to
get through
A ray of light is an extremely narrow
beam of light.
All visible objects emit or reflect
light rays in all directions.
Our eyes detect light rays.
We see images when
light rays
converge in our eyes.
Light can be reflected. Reflection is the
bouncing of light of a solid object
It is possible to see
images in mirrors.
image
object
Mirrors are good at reflecting light rays.
Plane Mirrors
How do we see images in
mirrors?
Result:
Result:
•brainthinks
thinksthere
thereisisaalight
light
•brain
sourcebehind
behindthe
themirror
mirrorwhere
source
where
light
rays originate
the
lightthe
rays
originate
•seean
animage
imagebehind
behindthe
the
•see
mirror called a virtual image
mirror called a virtual image
normal
Angle of
reflection
Angle of
incidence
reflected
ray
incident
ray
θr θi
Mirror
Regular vs. Diffuse Reflection
Regular
Diffuse
Properties of an image
Attitude
Type
Upright
Real
Inverted
(vertical)
Laterally
Inverted
Size
Virtual
Enlarged
Reduced
Same