Most slide projectors have an adjustable lens that moves in and out when you focus the image of a slide on a screen. Before you start experimenting, read "Inside Your Slide Projector" near the bottom of this page and take a look at the bulb in your projector, so that you will recognize the image of the light source.
A few sheets of heavy card stock (like index cards, NOT cardboard)ĭuring these activities, you will see the image of the projector's light source: the filament of a light bulb.Large sheet of white posterboard (at least 23" by 29") for a screen.You can use these activities as a class demonstration or as learning stations. Science involves a great deal of "tinkering around," a process integral to research and development. At the Exploratorium, we have found some of the most interesting effects when we were just "tinkering around" with the slide projector and pinholes. Don't be afraid to experiment to find the best conditions. You will have to play around to see some of the effects we have found and to find the methods that work best with your equipment. Try a few simple experiments with your slide projector. The light shining from the slide projector - like the sunlight in your playground - is more interesting than you may think. The instructions here are intended to help you get started in a more advanced investigation of the properties of images. Using your slide projector, a filter, and a screen, you can isolate both the image of the slide projector's light source and the image of the slide through which the light is shining. As a result, the light carries an image of the slide. Light from the projector's light bulb passes through the slide, and the three informationcarrying characteristics of the light - the frequency or color, the direction, and the intensity - change. When you show slides, you use the same basic ingredients: a light source, a filter, and a screen.
On the Image Walk, you used a filter and a screen to isolate the image of a light source, the sun.
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