11.6 Laws of Reflection: Plane (flat) mirrors
Jan 20, 2016
11.6 Laws of Reflection:Plane (flat) mirrors
Three ways to Classify Matter: 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…The Laws of Reflection
1. angle of incidence = angle of reflection
2. The incident ray, reflected ray and the normal all lie in the same plane
Light Reflecting off Surfaces
Regular (Specular) Reflection: Reflection of light off a smooth shinny surface (ex. mirror)
Light Reflecting off Surfaces
Regular (Specular) Reflection: Reflection of light off a smooth shinny surface (ex. mirror)
Light Reflecting off Surfaces
Diffuse Reflection: Reflection of light off a rough surface (ex. moving water)
SHOW DEMO
Light Reflecting off Surfaces
Diffuse Reflection: Reflection of light off a rough surface (ex. moving water)
11.7 Images of Plane Mirrors
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 - the object is not actually behind the mirror
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
Properties of an Image
Use the acronym SALT
How do we see the image?
Draw the Image:
Sample Question
S- same size
A- upright
L- 2 cm from mirror
T- virtual
Sample Question
Reflection Worksheet Complete the worksheet
Remember that the virtual image must be the same difference from the mirror as the real object
Use equal perpendicular lines to locate the image
Homework:
Work Sheet
Pg 486 # 2-5
Pg 493 # 1-4, 7