-: MAKING A SLIDE PROJECTOR :-

A slide projector is an optical instrument used to see slides on a screen in an enlarged image. It makes use of a good quality magnifier and a light source. When light falls on the slide, its enlarged image is projected on a screen. This simple project will demonstrate the principle of projection. 

-: MATERIALS REQUIRED :-

• Take one magnifying lens of about 3 inch diameter and 50 cm focal length.
• Take one cardboard box with a deep lid and of the same height as that of the focal length of the lens. The other dimensions of the box are not important. In the center of the lid of the cardboard box, cut a hole to mount the lens. Then glue the lens in place 

• At the centre of the bottom of the box, cut a hole slightly larger than your slides.       
•  For the rear part of the projector, take the second box and make a hole in the bottom of this box of the same size as the hole in the front box. The two holes should line up with each other when the boxes are placed on their sides.

                     

• Join the two boxes by gluing the pieces of cardboard to the sides. Leave a small gap between the boxes for the slide carrier. 

                  

• Make the slide holder from a piece of thick cardboard. This is used to position a slide between the holes in the boxes. 

                        

                 

•  Set slide between two box.

• In a darkened room, project the slide on to a white paper or white wall by switching on the bulb. To get a sharp picture, adjust the focus by pulling out or pushing in the deep lid that holds the lens.