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Code Number: 6A20.50
Demo Title: Mirrors - Cylindrical Amusement Park Mirrors
Condition: Excellent
Principle: Curved Mirrors
Area of Study: Optics
Equipment:
Bendable Metal or Plexiglas Mirror Sheets.
Procedure:
Bend the mirror along either of the two axis and observe the image as you move the object farther away from the mirror. At some point the image should turn upside down. When the image is upside down there should also be no perversion. The focal point of the mirror can also be changed by the amount of curvature applied.
References:
- Hasan Sahin Kizilcik, "Using te Predict-Observe-Explain Technique to Address misconceptions About Image inversion in Spherical and Cyclindcal Mirrors", TPT, Vol 63, #4, April 2025, p. 274.
- Bruce W. Liby and Sean Heffernan, "A Student-Built Flatness Gauge to Determine if a Fitness Center Employs Thinning Mirrors", TPT, Vol. 58, #2, Feb. 2020, p. 123.
- Martin Gardner, "Physics Trick of the Month: the Unreversed Reflection", TPT, Vol. 34, #9, Dec 1996, p. 563.
- Se‐yuen Mak and Karl C. Mamola, "Apparatus for Teaching Physics: Low‐Cost Cylindrical Mirrors", TPT, Vol. 31, #3, Mar. 1993, p. 186.
- T. H. Ansbacher and Joe Pizzo, "Deck the Halls: The Nonreversing Mirror with a Twist", TPT, Vol. 25, #2, Feb. 1987, p. 104.
- Thomas M. Holzberlein, "How to Become Dizzy with Derman's Optical Puzzle", TPT, Vol. 20, #6, Sept. 1982, p. 401.
- Paul E. Wack, "Cylindrical Mirrors", TPT, Vol. 19, #6, Dec. 1981, p. 581.
- Samuel Derman, "An Optical Puzzle That Will Make Your Head Spin", TPT, Vol. 19, #6, Sept. 1981, p. 395.
- Robert H. Johns, "Notes: Flexible Mirrors", TPT, Vol. 10, #5, May 1972, p. 266.
- Alan C. Traub, "Two Teaching Demonstrations Using Flexible Mirrors", AJP, Vol. 35, #6, June 1967, p. 534.
- R. Andrew Hicks, "The Customized Reflections of Freeform Mirrors", Physics Today, Vol. 63, #10, Oct. 2010, p. 72.
- "O-140. Mirror on Chest", DICK and RAE Physics Demo Notebook, 1993.
- Jearl Walker, "6.152. A Fast Spin in a Curved Mirror", The Flying Circus of Physics Ed. 2, p. 304.
- Christopher P. Jargodzki and Franklin Potter, "52. An Optical Puzzle", Mad About Physics, p. 18, 168.
- "Cylindrical Mirror", Exploratorium Science Snackbook, p. 35.1.