Demonstration Description: A plain mirror (e.g., your bathroom mirror) produces a virtual image (image is upright). A concave mirror also produces a virtual image if the object is inside the focal point. An object outside the focal point produces a real image (image is inverted).
Virtual Image Option:
Arrange large concave mirror so that students can view their face as they walk through the focal point; their image changes from real to virtual.
Real Image Option:
Black box with light inside, as pictured below.
A concave, silvered mirror faces a box with an open face. The box contains a lamp hidden from the audience. The real image of the lamp is formed on top of the box and can be seen by the people directly in front of the box. The whole set up can be rotated on a stool so as to cover all the audience.