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What is the working principle of slide projector?

Slide projectors work by shining light through specialized photographs called slides. When the light goes through the slide, it enlarges the photograph and displays the image on a screen or on the wall. Usually,slide projectors use a carousel or magazine to hold many different slides.

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Slide projectors work by shining light through specialized photographs called slides. When the light goes through the slide, it enlarges the photograph and displays the image on a screen or on the wall. Usually, slide projectors use a carousel or magazine to hold many different slides.
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A powerful beam of light through the transparent slide image is focused by a convex lens to produce an image on a screen
 
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