11Demo:

Print:Supplies:

Concave Review

SALT• Size of IMAGE (compared to object)

• Attitude

• Location

• Type

Concave Review

Warmup“Objects in the rearview mirror may appear closer than they are.”1. What kind of mirror do you suppose is

used in a rear-view mirror for he driver and passenger of a vehicle?

2. Why do you suppose they use this type of mirror?

3. Why do objects appear closer?

Images in SpoonsConcave

sideConvex side

Describe the Image S

ALT

SALT

Complete the diagram below and the “SALT” Table

Convex Mirror

Convex Mirror

Convex Mirror

Convex MirrorDraw a stick-man to the right of a convex mirror. Use a ray-diagram to depict his image

Convex MirrorDraw a an object of your choice to the right of a convex mirror. Use a ray-diagram to depict his image

Convex Mirrors

• Now the F (virtual focus) and C are behind the mirror

• Light rays seem to come from an apparent light source behind the mirror (virtual image)

Uses of Convex MirrorsSecurity Mirrors Side Mirrors

Rules for Drawing Images1. A ray parallel to the principal axis is

reflected as if it had come through the focus

2. A ray aimed at the centre of curvature is reflected back upon itself

3. A ray aimed at the focus is reflected parallel to the principal axis

Diagram 1

Diagram 2

Diagram 3

Real & Virtual Images• Real image = an image that appears

in front of the mirror and can be projected onto a screen

• Virtual image = an image that appears to be behind the mirror and cannot be projected onto a screen

Summary of Types of Images

Mirror Type Real Image Virtual ImagePlane Never ALWAYSConvex Never ALWAYSConcave If the object is farther

away from the mirror than F

If the object is between F and the mirror

Convex Mirrors• http://www.edumedia-sciences.com/e

n/a309-convex-mirror