December 01, 1991 Filed in:
Demo CornerT.J. Elgin Wolfe, University of Toronto
An interesting demonstration that makes use of the location of the virtual image formed by a plane mirror can be done with a black cloth, a small candle (about 2 cm in height), a dull dark opaque shield about 3.5 cm tall and bent at right angles, a large pane of thin window glass, two retort stands, 4 adjustable clamps, a 400 mL beaker, and coloured water. To highlight the beaker in the dim light, outline the outer edges (as viewed by the class) with masking tape.
Read More...Tags: Optics
March 01, 1991 Filed in:
Demo CornerFrank Allan, Science Co-ordinator, Ottawa Board of Education
The world’s simplest speaker can be constructed in a matter of seconds.
Read More...Tags: Electricity, Magnetism
