Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 28 - Think and Explain: 86

Answer

This is done so that the slide's image is right-side up.

Work Step by Step

The ray diagram for an image made by a converging lens is shown in Figure 28.47c. The flower is the illuminated slide, i.e., the object to be projected onto the screen. The real image, projected on a screen, is inverted with respect to the object. Therefore, in an old-fashioned slide projector, you inserted your slides upside down.
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