Light Reflection and Refraction
Light & Matter
KATE ALBARRACIN
Reflection & Reflection & Light
Light bounces off of objects
Light bends in objects
Sorting
Reflection
Refraction
Eyeglasses
Prism
Rainbow
Magnifying glass
Pond Water
Mirror
Shiny Screen
Key
straight
Light travels VERY FAST – about 300,000
kilometers per second or 186,000 miles
per second.
At this speed light
could travel the
equivalent of 8 times
around the world in
one second!
Light travels in _______ lines:
Straight
Light hitting at an
angle is bent
Light hitting
straight on is
not bent
•
Refraction is when light
speeds up or slows down due
to travelling in a different
medium
Causes the ruler to look bent
at the surface
•
The mediums in this example
are water and air
A medium is something that
light travels through!
Light rays are slowed
down by the water
The amount that light bends
when it enters a new
medium is called the “index
of refraction”
Straw Demo
Regular vs. Diffuse Reflection
Smooth, shiny surfaces
have a
regula
r
reflection:
Rough, dull surfaces
have a
diffuse
reflection.
Diffuse reflection
is
when light is scattered
in different directions
Part 2 - Reflection and
Mirrors
Reflection from a mirror:
Incident ray
Normal
Reflected ray
Angle of
incidence
Angle of
reflection
Mirror
The Law of Reflection
The Law of Reflection
Angle of incidence = Angle of reflection
Angle of incidence = Angle of reflection
In other words, light gets reflected from a surface at
____ _____ angle it hits it.
The
same !!!
We see things because they
reflect
light into our eyes! This is
literally the only way we get to
see things! ALL objects we see
either create light or reflect
light!!
Homework
Explore the fascinating world of light and its behavior with reflection and refraction. Learn about how light travels, bounces off objects, and bends in different mediums. Discover the properties of light, the phenomenon of refraction, and the laws governing reflection. Delve into topics such as regular versus diffuse reflection, mirrors, and the captivating demonstrations that showcase these principles in action.
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Presentation Transcript
Light & Matter KATE ALBARRACIN Reflection & Reflection & Light
Reflection Refraction Light bounces off of objects Light bends in objects
Sorting Reflection Refraction Mirror Shiny Screen Key Eyeglasses Prism Rainbow straight Magnifying glass Pond Water
Light travels VERY FAST about 300,000 kilometers per second or 186,000 miles per second. At this speed light could travel the equivalent of 8 times around the world in one second!
Properties of Light Light travels in _______ lines: Straight Laser
Light hitting at an angle is bent Light hitting straight on is not bent
Refraction The amount that light bends when it enters a new medium is called the index of refraction Refraction is when light speeds up or slows down due to travelling in a different medium Causes the ruler to look bent at the surface The mediums in this example are water and air
Regular vs. Diffuse Reflection Smooth, shiny surfaces have a regular reflection: Rough, dull surfaces have a diffuse reflection. Diffuse reflection is when light is scattered in different directions
Part 2 - Reflection and Mirrors Reflection from a mirror: Normal Reflected ray Incident ray Angle of reflection Angle of incidence Mirror
The Law of Reflection Angle of incidence = Angle of reflection In other words, light gets reflected from a surface at ____ _____ angle it hits it. The same !!!
We see things because they reflect light into our eyes! This is literally the only way we get to see things! ALL objects we see either create light or reflect light!! Homework
