EQUIPMENT : Lenses A, B, and Fresnel Lens, Light Source, Slide, Screen MAKE A PROJECTOR Using the light source indicated by your teacher, hold the slide you are going to project close to the light source. Place one of the lenses close in front of the slide and a white piece of paper for the screen about one meter away from the lens. Move the lens closer to and farther from the slide until you can see a focused image of the slide on the paper (you may have to move the paper a little too). 1) Describe the image compared to the object. Try the other two lenses as the projection fens. 2) Which lens set gives the best image? 3) What made you decide that image was the best? Try to get an image on your screen when the screen is moved to about two meters from the lens. 4) If you are able to get an image, describe how it has changed. WHAT IS THIS USEFUL FOR? This type of lens arrangement is used for slide projectors, overhead projectors and movie projectors. The light shines through the picture and is then projected by a lens onto a screen. Big screen TV's also use this type of projection system.

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URL: http://acept.la.asu.edu/PiN/opticskit/expt/experiment6.shtml