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A3: Transmission, Reflection, and Absorption of Light (SNC2P)

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Vincent Nguyen

on 10 December 2013

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Transcript of A3: Transmission, Reflection, and Absorption of Light (SNC2P)

Reflection
Absorption
- the process in which light energy remains in the object that it hits, and the light energy is converted to heat
Transmission
- the process in which light travels through an object and continues traveling
Types of Substances
Substances can be classified according to the way they transmit, reflect, and absorb light. The three different types of substances are
transparent
,
translucent
, and
opaque
.
A3: Transmission, Reflection, and Absorption of Light
Transmission, Reflection, and Absorption of Light
When light strikes an object, there are different ways it can be affected. Light can be reflected, refracted, absorbed, and transmitted, depending on the matter that it strikes.

When we look at an object, we see it because light travels in a straight line from the object to our eyes. Scientists use an arrow that shows the direction in which light is traveling, this arrow is called a
ray
.
Mr. Nguyen
SNC2P
Learning Goals:
- investigate the laws of reflection and use these laws to explain the characteristics of images formed by plane, converging (concave), and diverging (convex) mirrors;

- investigate how various objects or media (e.g. opaque, translucent, and transparent materials; black-and-white surfaces), reflect, transmit, or absorb light

- explain the laws of reflection of light, and identify how light reflects from various types of mirrors (e.g. plane, converging, diverging

Light Changes Direction
- the process in which light "bounces off" the surface of an object and travels to another direction
Light is Converted to Heat
Light Travels Through
Learning Check
1. Use a flowchart to describe the three things that can happen to light when it hits an object.

2. Sketch how a book would look if it were behind a sheet of
a) clear plastic wrap
b) waxed paper
c) aluminum foil

3. Classify each of the three materials above as opaque, transparent, or translucent
Reflecting
Surfaces
Substances that can reflect light to produce an image are called ________. The typical mirror is a piece of glass with a thin coating of silver on the back. Three types of reflecting surfaces are
plane mirrors
,
convex mirrors
, and
concave mirrors
.

Did you know that plane glass mirrors reflect approximately 85% to 90% of the light striking them? The remainder of the light striking a glass mirror is absorbed and converted into heat energy.
Law of Reflection
The angle of reflection is
equal
to the angle of incidence (
i
=
r
).
The reflected ray and the incident ray are on opposite sides of the normal.
The incident ray, the normal, and the reflected ray lie on the same plane (flat surface).
Key
Terms
Images in Plane Mirrors
This figure shows what happens to the light rays when you put a mirror in front of the tomato. The rays that reach your eye appear as if they are coming from a point behind the mirror. Since light travels in straight lines, your brain interprets the pattern of light that reaches your eye as an image of the
tomato behind the mirror.
Tomorrow's agenda:
- Virtual labs on Reflection
and Refraction
Homework:
Page 331: #1, 2
medium
Characteristics
of Images
Images formed by a mirror have four main characteristics. They are:

1.
Size
: may be smaller than the object
viewed, larger than the object viewed,
or the same size as the object viewed.
2.
Orientation
: upright (right-side up) or
inverted (upside down).
3.
Location
: object can be behind the
mirror, closer to the mirror, etc.
4.
Type:
the image can be a real
image or a virtual image.
How does Light Reflect from Different Mirrors?
A.
Plane Mirrors
- the object viewed in a plane mirror appears to be behind the mirror, which is an optical illusion.
The images produced are: upright, same size as the object, flipped sideways, and the same distance behind the mirror as the object.
The image cannot be projected onto a piece of paper, therefore, it is considered virtual

B.
Convex Mirror
- objects form an image that is always:
- smaller, upright, behind the mirror, virtual

C.
Concave Mirror
- wider range of images compared to plane and convex, objects will always have an image that is:
- smaller, inverted, real
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