demo: string reflecting on mirror,
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Supplies:. Print:. 7. Demo: String reflecting on mirror,. Warm-Up Exercise. Currently in the classroom, find an object that is Opaque Translucent Transparent. Agenda. LESSON: Mirrors, Law of Reflection, Magnification Classwork. Review. Angles in Mirrors. Law of Reflection. - PowerPoint PPT PresentationTRANSCRIPT
7Demo: String reflecting on mirror,
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Warm-Up ExerciseCurrently in the classroom, find an
object that isOpaqueTranslucentTransparent
Agenda
1. LESSON: Mirrors, Law of Reflection, Magnification
2. Classwork
Review
.
Angles in Mirrors
• the incoming ray
Incident ray
• The angle between the incident ray and the normal
Angle of Incidence
• the dotted, imaginary line • At the point of reflection• Perpendicular to the mirror
Normal Lines
• The angle between the reflected ray and the normal
Angle of Reflection
Law of Reflection•The
angle of incidence is always equal to the angle of reflection
The Law of Reflection states:
Rules for Drawing Plane Mirrors
Images in the Mirror What is the distance from the mirror to
the Virtual Image? How are the images different?
Complete the Diagram Below Demonstrating Mirror-Reflections
WORD
Complete the Diagram Below Demonstrating Mirror-Reflections
Science
See folding paper trick…
Reflections using Mirrors The line of sight principle
in order to view an image of an object in a mirror, a person must sight along a line at the image of the object.
How many people can be seen in the mirror by: A? B? C?
WARMUPDraw the reflection of light rays on the plane mirror. Use normal lines to guide your work
Curved Mirrors
Draw the light rays from the source
Positions on Curved Mirrors
•a point where light rays meetFocal point (F)
•Centre of the sphere of which the mirror is a part.
Centre of curvature (C)
•middle part of a curved mirrorVertex (V)
•A line passing through F, C and V
Principle Axis
Positions on a Curved Mirrors
•Distance between C and F
Focal length
•Half of the diameter of the circle
Radius
The distance between the vertex and the object is represented by do
The distance between the vertex and the image is di
The height of the object is ho
The height of the image is hi
The focal length (f) is the distance from the vertex to the focal point of a curved mirror
A real image is an image formed by light rays that come from a location of the image.
Curved Mirrors The distance between the vertex and the
object is represented by do
The distance between the vertex and the image is di
The height of the object is ho
The height of the image is hi
The focal length (f) is the distance from the vertex to the focal point of a curved mirror
A real image is an image formed by light rays that come from a location of the image.
Concave Mirrors
Also called a converging mirror, a concave mirror has a surface that curves inward like a bowl.
The closer the object gets to the focal point, the larger the image becomes
Uses for Concave Mirrors Flashlight-to produce a parallel beam
Headlights-to produce a parallel beam of light that can be directed down or straight
Solar Energy http://www.youtube.com/watch?v=qYeynLy
6pj8
Magnification The measure of how much larger or
smaller an image is compared with the object itself.
We can measure it using: Magnification=image height
object height
Distance can be measured the same way: Magnification= Image distance Object distance OR Equation: M= hi
ho
Example Magnification A microscope produces an image that is
5.50 x 10ˉ4 m high from an object that is 2.00 x 10ˉ6 m high. What is the magnification of this microscope?
Solution Equation: M= hi
ho
M=5.5 x 10ˉ4 m 2.00 x 10ˉ6 m =275 The magnification of the microscope is 275
times.
Convex Mirrors Mirror with a
surface curved outwards
Convex Ray Diagram
The first ray (red) travels from a point on the object parallel to the principal axis.
The second ray (blue) travels from a point on the object toward the focal point
Class work Pg. 433 #1,2,7,12