Students then turn the mirror until the reflection of the dotted line is in line with the real dotted line. Next students line up a ruler with the reflection of the straight line in the mirror. The reflection of the straight line in the mirror is extended and drawn on the paper. Next the angle of each side of the broken line is measured with a protractor. Students use two mirrors, a protractor and an object to find out how many images are formed when the two mirrors are placed at different angles.
Students construct a kaleidoscope using three plastic strips taped into a triangle with duct tape.
In between two clear contact circles are put a few sequins and beads. This circle is looked at through the plastic triangle strips.