Light Energy_Coelho.notebook
Day 1 of 3
Light Energy:
Transparent, Translucent, Opaque
Transparent
Translucent
Opaque
Allows ALL light to pass through itself
Allows SOME light to pass through, but not all light
Allows NO light to pass though at all
Examples:
Examples:
Examples:
­clear glass
­windows
­plexi glass
­plastic wrap/bubble wrap
­wood
­cardboard
Day 2 of 3
What is Reflection?
What is Refraction?
the bouncing back of light
rays from a surface
the bending of light rays as they move from one material into another material
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Light Energy_Coelho.notebook
Transmitted: light can be transmitted through clear object ­ transmitted light that bends as it passes through is refracted
Absorbed: light is absorbed by objects
ex: the red apple absorbs ALL the colors of white light (orange, yellow, gree, blue, indigo, and violet) except....
RED (it's what we see!)
Reflection Station 1: Mirror Mazes
What did you observe:
­light travels in a line
­light can be bent and directed using mirrors
What common technology do we use to demonstrate this?
­periscopes, telescopes, cameras
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Reflection Station 2: Copy Cat CD
What did this station teach you about light energy?
­light travels in straight lines, light can be reflected, and reflecting light can create optical illusions
Reflection Station 3: Laser Tag
What is it called when light bounces off an object?
­reflection
What concepts about light energy did this station teach you?
­light travels in a straight line
­light can be reflected using a series of mirror and directed to a target
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Reflection Station 4: Reflection Reactions
What did this station teach you about light energy?
­light travels in straight lines
­light can be reflected
­reflecting light can create optical illusions
Reflection Station 5: What's the Angle?
Light will bounce off a mirror at the same angle that it hits the mirror ­ this is called reflection.
What did this station teach you about light energy?
­light travels in straight lines
­light can be reflected
­reflecting light can create optical illusions
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Light Energy_Coelho.notebook
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http://id.mind.net/~zona/mstm/physics/light/rayOptics/reflection/reflection1.html
Reflections
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Light Energy_Coelho.notebook
When light passes through media/material of different densities the light can be refracted, or "bent."
Concave lenses: thicker on the edges than in the middle and cause light rays to diverge (SPREAD OUT)
­used to MINIMIZE (make smaller)
Convex lenses: thicker in the middle than on the edges and cause the light rays to converge (come TOGETHER)
­A convex lens in the path of light will spread the beam of light over a larger surface
­Convex lenses are used as MAGNIFIERS
Light Refraction Station 2: The Broken Pencil
How did the pencil change in the four different types of liquid?
Why do you think the pencil appeared to change again?
What do we mean when we say the light bent ­ what do we call that?
­REFRACTING!
How is this different from reflection?
­When light reflects, the light rays are sent back
­When light refracts, the light rays are either spread apart or pushed together to make the image appear different
What does it mean to refract light?
­As light travels through different types of matter it spreads out or gets pushed together.
­This changes the way we see the images light is going through
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Light Energy_Coelho.notebook
Water Prism
Draw and describe what happens:
Prisms refract light.
Prisms create rainbows of light as they split the light into its wavelengths.
Create a technical drawing of a prism as it interacts with light....describe what happens the light as it passes through the sides of the of the prism:
Do you know ROY G. BIV?
http://www.brainpop.com/science/energy/rainbows/
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Light Energy_Coelho.notebook
http://www.physicsclassroom.com/class/refrn/u14l1f.cfm
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Attachments
5­2­5T1U2A08­Light_Energy­mberry_OI_3.pps