Reflection and
Mirrors
A
plane mirror is one that
is flat
 Light hits the mirrors and
reflects back to our eyes.
We see an image "in" the
mirror
Reflection can occur in still water too!
Read Only!
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
Dyslexia is a condition that many
people have – its where people
have difficulty reading print
Examples:
Read Only!
 One
problem with people
who have dyslexia is the
glare from the light
reflecting off white paper
 Sometimes using coloured
filters helps!
Characteristics of an Image
An image can have 4 characteristics
when comparing to the object
 Location: closer, farther or same
distance
 Orientation: upright or inverted
(upside down)
 Size : larger or smaller
 Type: virtual (imaginary rays cross) or
real (light rays cross)
Remember L.O.S.T

Writing Reflectively

Looking ONLY at the mirror, write
your name so that it appears right
side up!
Mini Lab
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
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
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In grps of 4 collect the following materials:
white paper, plane mirror, protractor, ray
box Draw a capital T
Place the mirror along the top of the T
Aim the ray of light at the mirror as seen
above
Trace the light in the and reflected light
Use the protractor to measure the angle of
each line – measure from the centre line
Fill out the LOST for the image you see in
the mirror
Characteristics of Images in
Plane Mirrors
 L:
same distance behind
mirror
 O: Right side up and left-right
switch
 S: Same size
 T: Virtual (there are no light
rays where the image is)
Reflection Terms
Normal – the line drawn
perpendicular to the
reflecting surface
Incident Ray – a ray
traveling towards the
reflecting surface
 The
angle of Incidence
(Θi) – the angle between
the incident ray and the
normal
 The point of incidence
–the spot where the
incident ray hits the
reflecting surface
 Reflected
Ray – a ray of
light that bounces off a
reflected surface
 Angle of Reflection (Θr)
– the angle between the
reflected ray and the
normal
Laws of Reflection
1.) The angle of incidence
equals the angle of
relfection (Θi = Θr)
2.) The incident ray, reflected
ray and normal all lie in the
same plane (all flat)
Reflection can occur on 2 types of
surfaces:
Reflection
Specular
Reflection
1. Shiny,
smooth
surfaces.
Diffuse
Reflection
2. Rough
surfaces
READ ONLY
Worksheet
 How
do you draw the
image you see in a
mirror?
 Complete the worksheet
after seeing the teacher
complete an example