Download Reflection Refraction Notes

Honors B Physics 2015- Reflection/Refraction Ch 22
Light
1. What are electromagnetic waves?
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2. The electromagnetic spectrum
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How do you measure it?
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Wavelength
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Frequency
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Wave speed
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a. What does wave speed depend on?
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b. How did Maxwell determine the speed of all electromagnetic waves?
• Why do astronomers looking at distant galaxies talk about looking
backward in time?
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Know the terms wavelength,
frequency and wave speed
Honors B Physics 2015- Reflection/Refraction Ch 22
Drawing
Uses
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d. The wavelength of green light is about 500 nm. How many wavelengths
thick is a 100um thick hair?
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e. What electromagnetic waves can humans see?
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f. What electromagnetic waves can other animals see?
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g. What does the "brightness" of light depend on?
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h. What does the color of light depend on?
i. What is the common color for tennis balls? Why?
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*Know the order
of the
electromagnetic
waves.
*Know what the
brightness of light
depends on
*know what the
color of light
depends on
*Know the spec--1
of all
electromagnetic
waves
Honors B Physics 2015- Reflection/Refraction Ch 22
j. What does Einstein's famous equation mean?
3.
Be able to draw light. What
evidence do we have that light
travels in straight lines?
Drawing light vvavg 'tO show reflection. How do we know light travels in
straight lines? < \
normal
4. Law of reflection
5. Two mirrors make an angle of 120 0 with each other. A ray is incident on mirror
1\41 at an angle of 65 0 to the normal. Find the angle the ray makes with the
normal to M2 after it is reflected from both mirrors.
6. When looking outdoors through a glass window athight, you sometimes see a
double image of yourself. Why?
7. Specular Reflections
Specular Reflection
(smooth surfaces)
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8. Diffuse Reflections.
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Diffuse Reflection
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(rough surfaces)
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9. What determines the frequency (color) of reflected light for opaque materials?
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*Be able to apply the law of
reflection to
problems/pictures
*What does the color of
objects depend on?
Honors B Physics 2015- Reflection/Refraction Ch 22
Know how one-way minors
work.
*Why do you get red eye in
photographs?
10. How do one-way mirrors work?
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11. Why is glass transparent to visible light, but opaque to the ultraviolet and
infrared?
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12. Why does your eye appear black but sometimes in photographs people's eyes
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look red?
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13. Why is the sky blue?
14. Why are sunsets red?
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15. Why do we see mirages due to reflections?
*Be able to explain why the sky
is blue and why sunsets are red.
Honors B Physics 2015- Reflection/Refraction Ch 22
16. Refraction
a. What is refraction? Why does it happen?
17. Under what conditions is a mirage formed? On a hot day, what are we seeing
when we observe a mirage water puddle on the road?
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18. Explain why a spoon partially in water appears to be bent?
19. The level of water in a clear, colorless glass is easily observed with the naked eye. The
level of liquid helium in a clear glass vessel is extremely difficult to see with the naked
eye, Explain.
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20. Snell's Law
21. Index of refraction
Be able to apply Snell's Law.
What wave characteristics
change when a wave enters a
new medium?
Honors B Physics 2015- Reflection/Refraction Ch 22
22. Draw the light ray through each of the substances.
Index of
refraction
Air
Water
Quartz
Diamond
Incoming ray
1.00
1.33
1.54
2.42
Outside: air
Layerl: diamond
Layer 2: Quartz
Layer 3:Water
Layer 4: Quartz
Outside: air
Be able to apply Snell's Law.
What wave characteristics
change when a wave enters a
new medium?
23. What is the speed of light in water?
24. A light ray of wavelength 58_91-un (produced by a sodium lamp) traveling through
air is incident on a smooth surface, flat slab of crown glass at an angle of 30
degrees to the normal. Find the angle of refraction
02. (ncrown glass=1.52)
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25. A flashlight on the bottom of a 4,00_m deep swimming pool Air
sends a ray upward and at an angle so that the ray strikes the Water
surface of the water 2.00 m from the point directly above
the flashlight. What angle does the emerging ray make with
the water's surface?
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Honors B Physics 2015- Reflection/Refraction Ch 22
26. A laser beam is incident at an angle of 30.0_ degrees to the vertical onto a solution
of corn syrup in water. If the beam is refracted to _19.24 degrees to the vertical,
a. What is the index of refraction of the syrup solution.? Suppose the light is
red, with vacuum wavelength 632.8 nm.
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b. Find the speed of the laser beam in the corn syrup.
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1‘,\/c. Find the frequency Of the laser beam in the corn syrup.
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d. Find the wavelength of the laser beam in the corn syrup.
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Be able to apply Snell's Law.
What wave characteristics
change when a wave enters a
new medium?
Honors B Physics 2015- Reflection/Refraction Ch 22
27. How does the human eye work? What part does 70% of the focusing?
A
B
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Know the basics of how the
human eye works. What does
the cornea do? What does the
lens do?
Dispersion
28. The index of refraction for red light in water is 1.331, and that for blue light is
1.340. If a ray of white light enters the water at an angle of incidence of 83.00
degrees, what are the underwater angles of refraction for the blue and red
components of the light?
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Why does dispersion happen?
Honors B Physics 2015- Reflection/Refraction Ch 22
Rainbow
a. Why does the arc of a rainbow appear
with red on top and violet on the
bottom?
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29. Total Internal Reflection
Be able to explain how
rainbows form.
*Know when total internal
reflection would take place.
*be able to calculate the
critical angle.
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a. Is it possible to have total internal reflection for light incident from air on water?
Explain
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30. Find the critical angle for a water-air boundary if the index of refraction of water
is 1.33
Honors B Physics 2015- Reflection/Refraction Ch 22
31. Why do diamonds. sparkle? What is the critical angle for a diamond? (n=2.419)
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32. How do fiber optics work?
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