What kind of lens is used in an overhead projector?

Answer 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.Source:Edmund Optics: Fresnel ... Read More »

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What kind of lens is used in camera?

Saints enjoy the blessings of canonization. ( comes from Canon Law and has nothing to do with firearms). some departed souls , not of Saintly merit, yet, are referred to as Blessed or Beata, this i... Read More »

What is the best overhead projector for home use in a room that has numerous windows and a lot of light?

shop for drapes or curtains first. then, has good reviews

Who was the inventor of the overhead projector?

The overhead projector was originally created by Roger Appledorn in the 1960s while he was working for the 3M corporation. The projector was met with little initial success, but was later labeled t... Read More »

How to Use an Overhead Projector in the Classroom?

Using an overhead projector in modern day classrooms may seem a bit antiquated. However, an overhead projector facilitates the display of an informative, clear and concise presentation. There is an... Read More »