# Optics: page 2

Optics Lessons / Tutorials: Click here for Ms. Twu's Notes for spherical mirrors and thin lenses

Optics: page 1 (Optics 1 to 5: EM spectrum, reflection, refraction, dispersion, rainbow)

Optics: page 2 (Optics 6 to 10: Refraction, critical angle, total internal reflection)

Optics: page 3 (Optics 11 to 16: Concave and convex mirrors)

Optics: page 4 (Optics 17 to 24: Converging and diverging lenses, multiple-choice questions)

Index of Refraction Lab (using semi-circular tray)

• AP Physics 2: Optics 6: Refraction Problem 1: Semicircular Dish
• Light traveling from air to glass (semi-circular block of glass): light refraction in a air glass surface, varying incidence angle https://www.youtube.com/watch?v=Jqoy9BIpiCk
• The light source in the demonstration is on the left side. Because light is retraceable, had the light source been on the right side, the light beam would have followed exactly the same path from right to left.
• AP Physics 2: Optics 7: Refraction Problem 2: Rectangular Block
• AP Physics 2: Optics 8: Critical Angle and Total Internal Reflection
• Do you remember how I had to spray smoke particles into air for you to see light rays in air? (It’s in the Optics 2: Ray Model, Geometric Optics, and Specular and Diffuse Reflection: AP Physics Lessons with Ms. Twu.) In this demo video, in order for the observers to see light rays in water, we would add a bit of milk or coffee creamer in the water, so there are particles in water to produce diffuse reflection. Otherwise we would not be able to see the rays in water. In any case, for this demo video, you only need to watch from beginning to 1:28. The rest of the video is just a repeat:
• Reflection and refraction of colored light in water air surface 2, varying incidence angle https://www.youtube.com/watch?v=2kBOqfS0nmE
• This next demo video is very similar to the last one, but it’s for glass-air interface. Again, you only need to watch from beginning to 1:28. The rest of the video is just a repeat:
• light refraction in a glass air surface, varying incidence angle https://www.youtube.com/watch?v=8VZHym6HqVU
• AP Physics 2: Optics 9: Critical Angle Problem and View from Underwater
• AP Physics 2: Optics 10: Diamond and Optical Fiber
• Optical fiber:
• Very clear path of light can be seen in this video (with straight thick demo “fiber”): Lightpipe - Large Scale Demo of Principle Behind Fibre Optics http://www.youtube.com/watch?v=m-Sc8-BWGcw
• Total Internal Reflection Part I: Demonstration https://www.youtube.com/watch?v=s7w1Z1FCgwA
• http://www.youtube.com/watch?v=EuhccACOd1U Physics 10 - Lecture 11: - Waves I (Sound channel and Maurice Ewing’s SOFAR spheres: Dr. Maurice Ewing http://en.wikipedia.org/wiki/SOFAR_channel ) Deeper water: colder and higher pressure so at about 1km depth: sound is the slowest. Due to refraction, (the way sound travels in the channel almost looks like how light rays travel through an optical fiber), sound travels in the channel like a 2-d wave instead of a 3-d wave without too much spreading. The SOFAR channel is mentioned in the Hunt for Red October book, but not in the movie. There is a layer like that in the atmosphere too: warm: ozone (stratosphere), lower: cooler air, then lower: warmer air. Professor Muller also talked about how we can hear distant sound at night (higher: warmer, near ground: cooler).

Optics Lessons / Tutorials: Click here for Ms. Twu's Notes for spherical mirrors and thin lenses

Optics: page 1 (Optics 1 to 5: EM spectrum, reflection, refraction, dispersion, rainbow)

Optics: page 2 (Optics 6 to 10: Refraction, critical angle, total internal reflection)

Optics: page 3 (Optics 11 to 16: Concave and convex mirrors)

Optics: page 4 (Optics 17 to 24: Converging and diverging lenses, multiple-choice questions)