| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 6A40.00 | Refractive Index | | |
| 6A40.10 | apparent depth with TV | PIRA 500 | |
| 6A40.10 | apparent depth with tv camera | Od-7 | Focus a camera on a spot and then note how far the camera is moved to refocus when a clear plastic block is placed on the spot. |
| 6A40.11 | apparent depth | Od-6 | Look down into a tall graduate and estimate the distance to a coin at the bottom. |
| 6A40.12 | focusing telescope method | 34-1.8 | Move
a telescope back and forth on a optical bench to focus on the front and then
on the back of a block of plexiglass or container of liquid. |
| 6A40.13 | microwave index of refraction | 33-7.8 | Index
of refraction is determined by measuring the distance between minima with
a movable plane mirror in a container of liquid. Diagram. |
| 6A40.15 | refractive index of ice | AJP 33(1),62 | Freeze water by pumping in a hollow acrylic prism and measure the minimum deviation. |
| 6A40.20 | count fringes | PIRA 500 | |
| 6A40.20 | count fringes | 6A40.20 | |
| 6A40.20 | Michelson index of refraction | AJP 35(5),435 | Place a gas cell in one leg of the Michelson interferometer and evacuate air or let in a gas while counting fringes. |
| 6A40.20 | Michelson index of refraction | AJP 39(2),224 | Count fringes of laser light as air is let into an evacuated chamber in one leg of a Michelson interferometer. |
| 6A40.20 | Michelson index of refraction | O-2c | A
vacuum chamber is put in one leg of a Michelson interferometer and fringes
are counted as air or a gas is leaked into the chamber. Reference: TPT 6(4),176. |
| 6A40.21 | Raleigh refractometer | 34-1.9 | Improvements
on the Raleigh refractometer to make the fringes more visible for easier
counting as the air is let back in to the tube. |
| 6A40.25 | index of refraction of He and SF6 | TPT 28(5),323 | In
addition to letting air (21 fringes) into one arm of the Michelson interferometer,
let in He (3 fringes) and SF6 (55 fringes). |
| 6A40.30 | Cheshire cat | PIRA 500 | |
| 6A40.30 | disappearing eye dropper | Disc 22-10 | Place an eyedropper in a liquid with an index of refraction matched to the glass. |
| 6A40.31 | more Christiansen filters | AJP 28(8),743 | A table of Christiansen filter pairs. See AJP 25,440 (1957) |
| 6A40.31 | Christiansen filters | L-33 | A mixture
of crushed glass and a liquid with the same index of refraction as glass
is warmed in a container and exhibits colors. Directions for making a permanent
display. Reference. |
| 6A40.36 | grating pattern shift | AJP 47(1),120 | Shine
a laser beam through a grating so the beam splits the air/liquid interface
and measure the difference in the diffraction pattern for the light passing
through the air and liquid. |
| 6A40.36 | grating in aquarium | AJP 54(10),956 | Mount
a transmission grating inside an aquarium and measure the diffracted laser
beam on the other end with and without water in the tank. |
| 6A40.37 | refraction with shadow and cube | L-29 | A shadow projected through a glass cube has a different length than normal. |
| 6A40.38 | refractive index of beer | AJP 46(4),426 | The
ratio of the apparent diameter to the actual diameter of a stick of pepperoni
in a glass of beer gives the index of refraction. In the classroom, use a
mesh projected on the wall and measure offset of a vertical wire. |
| 6A40.39 | Abbe refractometer | 34-1.7 | A liquid separates the hypotenuses of two right angle prisms. |
| 6A40.40 | variable index of refraction tank | PIRA 1000 | |
| 6A40.40 | variable index of refraction tank | AJP 40(6),913 | Shine a laser beam through an aquarium with an unstirred sugar solution. |
| 6A40.40 | variable index of refraction tank | 34-1.12 | How to make a tank with varying concentrations of benzol and CS2. |
| 6A40.42 | gradient index lens | AJP 56(12),1099 | A
small gradient index lens is passed around the class. It looks like a glass
rod but one sees an inverted image when looking along the axis. |
| 6A40.45 | mirage | PIRA 1000 | |
| 6A40.45 | mirage | L-32 | How to heat a long plate to demonstrate the mirage effect. |
| 6A40.46 | mirage | 34-1.15 | The image from a slide projector is directed just above a brass plate heated with a burner. |
| 6A40.47 | mirage with a laser | AJP 51(3),270 | A laser beam almost grazing a hot plate will show deflection when the hot plate is turned on. |
| 6A40.47 | laser beam deflection - thermal grad | AJP 51(5),475 | An apparatus for cooling a plate to deflect a laser beam downward. |
| 6A40.47 | mirage with laser | AJP 37(3),332 | A laser beam is imaged through a keyhole and the beam then passes through a 1 meter oven. |
| 6A40.47 | superior "superior" image | AJP 57(10),953 | A
laser beam passing through a tank of water begins to deflect immediately
when heat lamps are turned on. Images are also observed. |
| 6A40.48 | not a mirage with a laser | AJP 48(11),990 | I haven't figured this out and have to go home to eat, so maybe some other time. |
| 6A40.49 | mirage explaination note | AJP 42(9),774 | A note correcting misleading textbook explanations of the mirage. |
| 6A40.50 | oil, water, laser | PIRA 1000 | |
| 6A40.60 | Schlieren image | PIRA 1000 | |
| 6A40.60 | cheap Schlieren | AJP 49(2),158 | A small, compact, portable, and inexpensive Schlieren instrument using an ordinary lamp and a light source. |
| 6A40.60 | Schlieren, etc. | 34-1.27 | Show and
compare Schlieren, direct shadow, and interferometeric method of detecting
small changes in the index of refraction of air. Diagrams, Details in appendix,
p. 1352. |
| 6A40.61 | Schlieren image of a candle | AJP 29(9),642 | A
simple arrangement with a point source, lens, and candle near the lens, aperture,
and screen for lecture demonstration purposes. |
| 6A40.61 | Schlieren image of a candle | Op-1 | Laser light is used in Schlieren projection of a candle flame. |
| 6A40.62 | single mirror Schlieren system | AJP 52(5),467 | Two Ronchi rulings are placed at the radius of curvature of a spherical mirror. |
| 6A40.63 | Schmidt-Cassegrain schlieren | AJP 50(8),764 | Two Schmidt-Cassegraion telescopes are used to make a simple inline Schlieren system. |
| 6A40.65 | Toepler Schlieren apparatus | 34-1.26 | A simpler Schlieren setup with colors indicating amount of deviation. |
| 6A40.67 | refraction by gases | L-31 | Shadow project the Bunsen burner (H-137), hold a hot object in one arm on the Michelson interferometer. |
| 6A40.70 | short beer | PIRA 1000 | |
| 6A40.70 | tall beer | AJP 45(6),582 | Properly designed glassware makes the beer look taller. |
| 6A40.70 | cylindrical lens and short beers | AJP 43(8),741 | Analysis of the apparent inner diameter thick cylinder of a liquid of different index of refraction. |
| 6A40.70 | short beers | AJP 44(6),601 | Paint the inside of the illusion cylinder, (AJP 43(8),741). |
| 6A40.70 | beer mugs | AJP 47(8),744 | Two beer
mugs were found that have the same outer dimensions and both appear to hold
the same amount of beer when full, but actually differ in volume by a factor
of two. |
| 6A40.70 | short beer comment | AJP 44(8),799 | Easy explanation. |
| 6A40.90 | plasma laser-beam focusing | AJP 46(11),1197 | An
expanded laser beam grazing a flat combustion flame from paint stripper is
focused into a line. A second perpendicular flame gives a point. |