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Image Formation by Convex Lens

I have a proj...

Question

I have a projector that takes small pictures and projects them on to a large screen so that a large group of people can view the pictures.
What kind of the lens can be used to create images on the screen, and where should the pictures be placed in relation to the lens and its focal length, f?

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Solution

Concave lens can be used to project a small picture on a large screen so that if the object is at its focus then image can be magnified.

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