Download 05 Laws of Reflection and Plane Mirror Images

Laws of Reflection and Plane Mirror Images
Reflection
 When light strikes a surface, some is _______________; the rest bounces
off the surface. This is called ___________________.
Reflection on Different Surfaces
 Reflecting surface is rough - produces a ____________ reflection.
 Reflecting surface is smooth - produces a __________ (uniform) reflection
Reflecting Light Terms
 Reflection: The bouncing back of light from a surface
 Image: A reproduction of an object through the use of light
 Incident Ray: approaching ray
 Reflected Ray: ray that the mirror reflects
 Point of Incidence: place where incident ray strikes a mirror
 Normal: line at right angles to the surface of the mirror drawn at the point
of incidence
 Angle of Incidence: angle between the Incident Ray and the Normal
 Angle of reflection: angle between the Reflected Ray and the Normal
Laws of Reflection
1) The Angle of Incidence ___________ the Angle of Reflection
2) The Incident Ray, the Reflected Ray and the Normal all lie in the
______________________
Images in Plane Mirrors
 When your eyes detect light from a
plane mirror, your brain projects
these light rays backwards in a
________________
 This results in your brain thinking the
light source is behind the mirror


Impossible, a mirror is
opaque
This is a ________ image (an image
in which light only appears to come
from the image)
Image Characteristics
When discussing images we use the acronym LOST, the image is always
discussed relative to the object.
L
Location
O
Orientation
S
Size
T
Type
Image Characteristics of a Plane Mirror
 Location: Image distance is same as object distance
 Orientation: Laterally inverted
 Size: No magnification
 Type: Image is virtual (cannot be focused on a screen)
Attitude: Mirror image is laterally inverted.
Real Image:
 Image formed at the point where reflected rays converge (come together)
 Located in front of a mirror
 Will appear on a screen
Virtual Image:
 Image formed at the point where reflected rays appear to diverge
(disperse)
 Located behind a mirror
 Will NOT appear on a screen