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11.4 The Ray Model of Light
Light RayA line and arrow representing the
direction and straight-line path of light
Incident Light Light emitted from a source that strikes an object
Incident Light Ray
Properties of Light When light strikes matter, it can be…
1. Transmitted – light passes through a substance
2. Reflected – light bounces off an object
3. Absorbed – light is absorbed by object and converted to heat
Flat/Plane Mirrors Image:
A reproduction of an original object that is produced through the use of light
Mirror A polished surface reflecting an image
Mirrors
Terminology of Reflection
Terminology of Reflection
NORMAL
Terminology of Reflection
Incident Ray
NORMAL
Terminology of Reflection
Incident Ray
NORMAL
Angle of incident
Terminology of Reflection
Incident Ray
NORMAL
Angle of incident
Reflected Ray
Terminology of Reflection
Incident Ray
NORMAL
Angle of incident
Reflected Ray
Angle of reflection
11.6 Laws of Reflection:Plane (flat) mirrors
Matter can be classified as: Transparent
Transmits all or almost all incident light, object can clearly be seen through material
Ex. Clear glass
Matter can be classified as: Translucent
transmits some incident light but absorbs or reflects the rest, objects are not clearly seen through material
Matter can be classified as: Opaque
Does not transmit any incident light, objects are not seen through material
Try this: Classify each of these materials as transparent,
translucent or opaque: A textbook
Frosted glass
A single sheet of tissue paper
A clean sheet of glass
A rock
Apple juice
Sunglasses
Try this: Classify each of these materials as transparent, translucent
or opaque: A textbook- OPAQUE
Frosted glass- TRANSLUCENT
A single sheet of tissue paper- TRANSLUCENT
A clean sheet of glass- TRANSPARENT
A rock- OPAQUE
Apple juice- TRANSLUCENT
Sunglasses- TRANSPARENT
From our lab, we learned…
angle of incidence = angle of reflection
The incident ray, reflected ray and the normal all lie in the same plane
Light Reflecting off Surfaces
Specular Reflection: Reflection of light off a smooth surface (ex.
mirror)
Light Reflecting off Surfaces
Specular Reflection: Reflection of light off a smooth surface (ex.
mirror)
Light Reflecting off Surfaces
Diffuse Reflection: Reflection of light off a rough surface (ex. moving
water)
Light Reflecting off Surfaces
Diffuse Reflection: Reflection of light off a rough surface (ex. moving
water)
Images in Plant Mirrors
Pg 488- Leonardo da Vinci’s handwriting
Virtual Images An image formed by light coming from an apparent light
source
Light is not arriving at or coming from the actual image location
Characteristics of Images in a Plane Mirror
Lateral Inversion: The orientation of an image in a plane mirror that
is backwards and in reverse order
Reflection Worksheet
Complete the worksheet
Remember that the virtual image must be the same difference from the mirror as the real object
How do we see the image?
Properties of an Image
Use the acronym SALT
Sample Question
Sample Question
Sample Question
S- same size
A- upright
L- 2 cm from mirror
T- virtual