The document discusses reflection of light and several experiments to demonstrate reflection principles: - The gummy bear experiment uses red and green lasers and white light on lines of red and green gummy bears and a gummy worm to show how different colors reflect and absorb different wavelengths of light. - The three jar experiment places black, white, and colored paper in jars of oil and measures temperature changes over an hour to demonstrate how colors absorb and reflect heat from sunlight differently. - The maze experiment uses mirrors to redirect a laser or flashlight beam to a target, making it visually informative and engaging while promoting collaboration.

1. Reflection

2. REFLECTION
• The change in direction of a wavefront at an
interface
• ie. Light waves reflecting on the waters surface.
• The reflection of light allows us to see objects
that do not emit light themselves.
• Basic principles of reflection can be covered
include:
If Light not reflected it must be absorbed
Lights reflects differently on different surfaces
Reflective angle of light

3. Follow on:
• From Refraction and how colour is made to
Reflection and colour

4. Principle of Reflection
Light that is not reflected must be absorbed

5. Colour and Reflection
Depending how light is reflected and absorbed it
can effect the colour of an object.
all colours reflected = appear white
all colours adsorbed = appear Black
absorbed some and reflected some = Coloured

6. Gummy Bear experiment
• Line of Green
Gummy Bears
• Line of Red Gummy
Bears
• Gummy Worm
• 1 Red laser Pointer
• 2 Green Laser Point
• White Light

7. Gummy bear experiment
• First
– Red laser on Red
Gummy Bears
– Green Laser on Green
Gummy Bears
• Next
– Red Laser on Green
Gummy Bears
– Green laser on Red
Gummy Bears

8. Gummy bear experiment
• With the White light:
– Use on the Red and Green Gummy bears
– And Finally run along the Gummy worm

9. Point of Experiment and Reasoning
• What you should expect
from the experiment…
• Reasons
– Simple/ easy set up
– challenges
preconceptions
– Very visual
– Set Induction and
engagement

10. Three jar experiment

11. You will need:
• Three jars •Vegetable oil
• 3x Thermometers • Sun
• Paper (1x black, 1x white, 1x coloured)
• Check the temperature of the oil in each jar.
Record the temperatures every 5-10 minutes
for one hour.

12. Three jar experiment
• Facilitate a prediction from the students
• How the colours affect the temperature and
students understanding
– black = absorption of light
– white = reflection of light
– Colour = Some reflection and some absorption

13. Point of Experiment and Reasoning
• If light is not reflected
by a material, it must be
absorbed
• Connection and transfer
or
learning/understanding
to other topics
• Relate back to real life
(clothes, cars)

14. Video- Light and Colour Bill Nye
• http://www.youtube.com/watch?v=gtgBHsSzC
PE

16. SPECULAR REFLECTION

18. The Maze Experiment
• 4-5 mirrors
• A target
• A Torch or
laser pointer
• Use the mirrors
to redirect the
light to the target.

19. But what’s the point?
• Visually informative
• Easy to set up and pack up
• Engaging
• Promotes collaboration and cooperation
• You can use it to create
challenges/competitions
• Guided discovery
• Great lead-in to discussion and other activities