Locating images in a Plane Mirror

object

mirror

Image of object

S - Same size as object

A - upright

L - behind mirror

T - virtual

reflected

incident

Locating Images in a Plane Mirror

• From the top of the object draw 2 incident rays

• From mirror draw 2 reflected rays

• extend reflected rays behind mirror

• where the extended lines cross, behind the mirror, the image forms

• repeat above steps for bottom of object

Locating Images in a Plane Mirror

Is there any easier way? Of course...

mirror

2cm 2cm

3.5cm 3.5cm

object

Draw line & measure Repeat lines behind mirror

Locating Images in a Plane Mirror

•From top of object, draw a line perpendicular to mirror (along normal)•measure the distance of this line and extend the line, the same distance, behind the mirror•repeat this step from the bottom of the objectfor complicated objects, draw more than two lines