How Lenses Work for an Overhead Projectors Work Essay Example
The lens inside the overhead projector, known as the large and moveable piece at the top, contains mirrors that work together to reflect light and project an image onto a screen. The first mirror captures light from the base of the projector where transparencies are placed, while the second mirror reflects this captured light through a magnifying lens for larger projection onto the screen.
Light - The projector comprises a solitary light that is distinct from the lens, yet it plays a vital role in its operation. In an overhead projector, the light is positioned on the flat glass surface where transparencies are placed. This presence of light is essential for the lens to distinguish between the transparent section and the printed material on the transparency.
Magnifying Lens - The magnifying lens is crucial for ca
...pturing and presenting a larger and more distinct image that the mirror reflects onto the screen. Without this lens, the image would appear small. The size and clarity of the projection are influenced by how close the lens is to the transparency and how close the projector is to the screen.
The lens movement of the overhead projector involves a side knob that allows you to adjust the lens vertically along the projector arm. This adjustment feature enables you to change the focus of the lens.
When the lens is closer to the transparency, the image becomes sharper. However, this only applies when considering both the distance between the projector and the screen. To achieve optimal clarity, size, and distance combination, it is recommended to adjust the lens vertically each time you use the projector. During my class experience, I learned that a shorte
focal length results in greater magnification.
Bibliography
- Ireland, J.. (2011). How Lenses Work for an Overhead Projector.
- Retrieved February 4, 2012, from http://www.ehow.com/info_12172565_lenses-work-overhead-projector.html
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