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Reflection
Chapter 29
Reflection

When a wave encounters a new medium or
barrier some of the wave is bounced back
(reflected), and some is transmitted
(refracted)

Simulation
Law of Reflection


Angle of Incidence = Angle of Reflection
θi = θr

Always measured from Normal(Perpendicular)
θi
θr
Types of Reflection

Regular Reflection


Reflection of light from a smooth surface
Diffuse Reflection

Reflection of light from a rough surface
Image Types




Real – Light rays actually travel to that
location
Virtual – Light appears to be at that location
Upright – image is right side up compared to
object
Inverted – image is upside down as
compared to object
Plane (flat) Mirror
Mirror
The light we see appears to originate
from the other side of the mirror
Curved Mirrors

Concave Mirrors



Can produce real or virtual images
Rear View Mirrors on Cars
Convex Mirrors


Always produce virtual images
Image is always smaller
Curved Mirrors



Portion of a circle
Center of Curvature (C) is located at the
center of the Circle
Focal Length (focal point) (f) is located
halfway between the center of curvature and
the mirror along the optical axis
C
f
Concave Mirrors

Drawing Ray Diagrams

Any ray entering through the center of curvature
will, after interaction with the optical device
(mirror), leave (or appear to leave) through the
center of curvature
C
f
Concave Mirrors

Drawing Ray Diagrams

Any ray entering parallel to the optical axis will,
after interaction with the optical device (mirror),
leave (or appear to leave) through the focal point
C
f
Concave Mirrors

Drawing Ray Diagrams

Any ray entering through the focal point will, after
interaction with the optical device (mirror), leave
(or appear to leave) parallel to the optical axis
C
f
Concave Mirrors
C
f
Convex Mirrors

Same Rays as concave
f
C
Mirror Simulation

Simulation
Mirrors

Object distance, do


Where the object is located
Image distance, di

Where the image is located

Negative distance is located “inside” mirror,
opposite side
Mirrors

Object size, So

Image size, Si

Negative means inverted
Mirror Equations
1 1 1


f do di
Si
di
M

So
do
M = Magnification