|
|
|
Code Number: 6A20.30
Demo Title: Mirrors - Image of a Light Bulb
Condition: Excellent
Principle: Concave, Convex Mirrors, Focal Lengths
Area of Study: Optics
Equipment:
Large Parabolic Mirror, Inverted Light Bulb in a Box, Candle, Grill Lighter, and Small Spherical Mirror.
Procedure:
Clean the parabolic mirror thoroughly. Position the box in front of the mirror as shown. Care must be taken to position the box so that the light bulb image is on the dummy socket.
A candle can be made to appear to burn at both ends. Place the candle horizontal and at the focal point of the mirror and when lined up, light the candle.
One end of the candle will have the flame pointing upward while the other end of the candle will have the candle pointing downward.
References:
- Thomas B. Greenslade Jr., "A Scientific Mystery", TPT, Vol. 57, #4, Apr. 2019, p. 221.
- Robert M. Graham, "Real Image Produced by a Concave Mirror", TPT, Vol. 44, #3, Mar. 2006, p. 186.
- Robert M. Graham, "Convincing Students of the Existence of a Real Image", TPT, Vol. 32, #4, Apr. 1994, p. 238.
- R. D. Edge and Edwin R. Jones, Jr., "Optical Illusions", TPT, Vol. 22, #9 , Dec. 1984, p. 591.
- Christopher Conery, "The Reality of a Real Image", TPT, Vol. 21, #9, Dec. 1983, p. 589.
- Robert M. Graham, "Real Image Produced by a Concave Mirror", TPT, Vol. 15, #2, Feb. 1977, p. 116.
- D. Rae Carpenter Jr. and Richard B. Minnix, "O-165. Burn Candle at Both Ends", DICK and RAE Physics Demo Notebook, 1993.
- D. Rae Carpenter Jr. and Richard B. Minnix, "O-160. Is a Bulb in Socket? - Toy", DICK and RAE Physics Demo Notebook, 1993.
- G. D. Freier and F. J. Anderson, "Oc-10", A Demonstration Handbook for Physics.
- G. D. Freier and F. J. Anderson, "Oc-4", A Demonstration Handbook for Physics.
- George M. Hopkins, "Phantom Bouquet", Experimental Science, p. 211.
- David Kutliroff, "6. Burning a Candle at Both Ends", 101 Classroom Demonstrations and Experiments For Teaching Physics, p. 29.
- R. Gardner, "The Little Bulb That Isn't There", Make an Interactive Science Museum, p. 86 - 89.
- Raymond Bruman, "Touch the Spring", Exploratorium Cookbook I, p. 16.1 - 16.2.
- "Touch the Spring", Exploratorium Science Snackbook, 100.1 - 100.2.
- Brian Jones and Matt Fackelman, "Phantom Light Bulb", Don't Forget the Duct Tape, p. 89 - 92.
- "Spherical Mirrors", Selective Experiments in Physics, CENCO, 1962.