Light Waves

LIGHT WAVES Wrap-up

by Lauren Morriss

​Announcements

• ​All your work is due tomorrow:

  • ​Lab sheet from sound project

  • ​yesterday's virtual lab (email me the slides or submit through google classroom, and let me know who you worked with)

  • ​Today's quizziz lesson/ practice

• ​You may take notes on an index card for the quiz tomorrow

• ​What is on the quiz?

  • ​Notes and concepts covered Tue-Today (what is light and how does it behave)

​Yesterday's Refraction Lab

• ​You were able to measure how light is refracted yesterday.

• ​At the end of the lab you gathered measurements for different WAVELENGTHS of visible light.

• Look at the results below, what pattern's do you see?

Multiple Choice

Each color of visible light has a different...

• speed

• wavelength and frequency

• amplitude

Fill in the Blanks

Does the wavelength of light effect the angle of refraction? Explain how you know.

​WHITE LIGHT

• ​White light is actually a combination of ALL THE VISIBLE COLORS!

Open Ended

Based on what you observed in you lab, and what you've seen today, why do you think a beam of white light splits into a rainbow in a prism?

​Prism Demo

• ​OPTIONAL

  • ​You may explore the prism simulation to get a better understanding.

  • (link in google classroom)

​What you need to know about REFRACTION

• ​Light bends / refracts when it passes from one medium to another

  • ​If it enters something MORE DENSE (like air to water) the light is slowed down and bends down

  • ​If it enters something LESS DENSE, it speeds up and bends up.

• ​​Different wavelengths & frequencies of light are refracted differently.

  • ​low wavelength/ high frequency bends MORE.

• ​Colors of light all have different wavelengths

​Now, REFLECTION

• ​Light is reflected at the same angle it hits a surface.

• ​Know these terms:

  • ​incident beam = ray of light hitting a surface

  • ​reflected beam = the ray reflected off the surface

  • ​normal line = the imaginary line between the two beams

  • ​incident angle = angle between incident beam and normal line

  • ​​reflection angle = angle between reflected beam and normal line

​Reflection Game

​The following slide has a link to LAZER MAZE

​

​Please complete AT LEAST 4 levels, don't play other games :)

Lazer Puzzle Game | Play Lazer Maze Online | Beano.com

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Multiple Choice

When light bounces back it is _____

• Reflected
• Refracted
• Absorbed
• Optical Density

Multiple Choice

........... – the angle between the normal and the reflected ray.

• Angle of incidence
• Angle of reflection
• Angle of coincidence
• Angle of direction

Multiple Choice

........... – the angle between the normal and the incident ray.

• Angle of incidence
• Angle of reflection
• Angle of coincidence
• Angle of direction

Multiple Choice

The imaginary line perpendicular to a reflecting surface is called _____.

• crooked line
• parallel line
• angular line
• normal line

Multiple Choice

In the diagram, which letter represents the angle of incidence?

• A

• B

• C

• D

Multiple Choice

Law of reflection state that - The angle of incidence is .................. to the angle of reflection.

• equal
• double
• half

Multiple Choice

What is this called?

• refraction
• reflection
• reconstroction
• retraction

Multiple Choice

Which color of light is most refracted during dispersion by a prism?

• red
• yellow
• green
• violet

Multiple Choice

In what medium does light travel the fastest?

• vacuum
• air
• water
• glass

​Last new concept, ABSORPTION

• ​Just like with sound, light waves can be absorbed

  • ​That is when the wave energy is TRANSFERRED to a medium

• ​Think about it:

  • ​black absorbs a lot of light, that is why it gets so hot in the sun

  • ​the light energy is transferred to the material as heat