An experiment to acquaint the student with the multiple images formed when two plane mirrors are set at different angles .
Light travels in straight lines.
When two plane mirrors are used, an image in one mirror becomes an object for the second mirror. Using a protractor, draw the angles on a sheet of paper. Place 1 mirror on the 0 mark and the other on the angle being tested. It works well if the two mirrors are hinged together with tape. In most cases, they will now stand on their own.