Standard EPS Shell Presentation

Light And Optics
CPO Science
Key Questions
 What is light? How can we
make light?
 Why are there different colors
of light?
 How does light behave in a
Let it glow, let it glow, let it
 Take white board and keep white side
facing up. Don’t look at the bottom!
 When I say go, flip board over so white
side is down. Place part of a hand over
the square. Keep hand there!
 When lights go out, remove hand and
absorb and then emit energy
with their electrons
the energy emitted falls within
the visible spectrum we see it as light
Charge it up with color
 Take out the red, blue, and green LED
lights, plug them in, and use them to
energize the phosphorescent paper
 Remove the colored lights and observe
the paper with the room lights off
 How can you explain your observations?
Light and Color
 How does a TV or computer monitor display
many, many different colors when they start
with only red, blue, and green pixels?
 Mix blue and green light. What color do you
 Mix red and blue light. What color do you see?
 Mix red and green light. What color do you
 Mix all three lights!
 Simple Optical System
(Beaker Funhouse)
 Reflection/Refraction in a Prism
(Secret to Tic-Tac-Toe Invincibility
Prismatic Name Enlightenment)
 Critical Angle/Total Internal Reflection
(Laser Proving Ground)
What does
Transparent mean?
 What happens?
 What are some examples
of transparent materials?
What Is an
Optical System?
Anything that involves
Used to study how light
Simple Optical System
 Observe the Beaker with the
water and pencil in it
 Look at the Beaker from many
different vantage points
 What strange or interesting
things can you see involving the
image of the pencil?
 The pencil is bent
 There are two pencils
 There are three pencils
 The pencil is Magnified
 When you look straight down into the
beaker, the pencil doesn’t seem bent
Color Teaching Tool Slides
Color Teaching Tool Slides
in a Prism
 See Page 112 in the
Investigation Guide Handout
for written directions
 Take out Prism from CPO
Optics kit
 I can see the X at first
 When I move my head up and down the
X vanishes
 When the X vanishes the O takes its
 This seems to be happening at the same
angle, the “magic angle”
Prismatic Name
1. Repeat the process for the X and O
but instead of the X write your first
2. Also write your first name in place
of the O but this time underline
your name.
3. What information do you now see
that can help us explain what is
going on?
 I can see my name upside-down
 When I move my head up and down my
name vanishes
 When my upside-down name
vanishes the underlined name takes its
place, and it isn’t upside-down any
 This seems to be happening at the
same angle, the “magic angle”
Time to Experiment
 Use a Simple Model- Laser and Prism
 Build Upon What You Have Learned –
This Magic Angle is Critical to what is
going on
Setting Up Laser/Prism
 See Page 113 in the Investigation
Guide for written directions
 Take out Laser from CPO Optics kit
 Use Graph Paper we have provided
 The exiting beam exits at a different
angle for each trial
 When I move the laser up the paper,
the exiting beam angles more in the
downward direction
 At a certain point the exiting beam
 This seems to be happening at the
same angle, the “magic angle”
Conclusions from Experiment
 At a certain angle the beam is refracted in a direction
that doesn’t exit the prism
 This happens at a specific angle-The CRITICAL
 When the angle is bigger than the CRITICAL ANGLE
the beam experiences TOTAL INTERNAL
How We Can Use Optics
in Everyday Life
 Fiber Optics
 Laser Scanners
 Surgical Lasers
 Information Storage-CDs, DVDs
 High precision Distance Measuring
Study collections