Images in Plane Mirrors
Section 10.2 continued ...
Pages 414 to 418
Today we will learn about ...
• Virtual and real images.
• SALT ... The four characteristics of images.
Plane Mirrors
 The law of reflection applies to light rays
reflected from both flat mirrors and curved
mirrors.
 Plane Mirror: Any mirror that has a flat
reflective surface.
 The image in a plane mirror appears to come
from behind the mirror. It is not possible to
catch this image on a piece of paper placed
behind the mirror, since no light from the object
reaches this point.
Image Orientation in a Plane Mirror
• The law of reflection also applies to looking
at objects in a mirror.
• The image in a plane mirror is an exact
reflection of the actual image.
Image Orientation in a Plane Mirror
• The diagram shows that the light reflects off
the mirror in such a manner that the angle of
incidence is equal to the angle of reflection.
⦟r
⦟i
• Since the light rays are not coming from where
your image appears to be, it is called a virtual
image.
• Virtual image: an image formed by rays that
appear to be coming from a certain position,
but are not actually coming from this position.
• Real Images can be projected on to a screen
and touched.
Real Vs. Virtual Images
Real Image:
- Formed when reflected rays (not
extended rays) meet
- Located in the front of the mirror
- You need a screen to see the real image
IMAGES HAVE FOUR CHARACTERISTICS:
Size of image (larger, smaller, same)
Attitude of image (the way the image is oriented
… upright or inverted)
Location of image (closer than, farther away, or
same distance as object in the mirror)
Type of image (real or virtual)
Use …
SALT
SUMMARY OF IMAGES IN PLANE
MIRRORS
S – image is same size as object
A – image is upright
L – distance of image from mirror is equal to
distance of object from the mirror
T – image is virtual
1. Youtube video
2. Classwork:
a. Read textbook P.414-416
b. Worksheet
c. Textbook questions P.418 #1,2,4,6