Tue January 08, 2013 By: Tanmay K

Which type of lens is used in projector? convex or concave.

Expert Reply
Tue January 08, 2013
A Fresnel lens is used in overhead projectors. It is flat on one side, has grooves on the other side, and has the same thickness across the entire length of the lens.
Sat September 23, 2017


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