Fresnel Lenses | How They Work

Basics of Converging Lenses

The converging, or convex lens, is able to bring parallel rays of light toward a focal point. As a child, I played with a magnifying glass lens to burn leaves, grass, and other things.

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The lens can also be used in a different way to project light rays parallel to each other in a beam. Simple projectors work on this basic principle. A lighthouse is designed to do this.

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Lighthouses | Mid-Coastal Maine

The lighthouse at Marshall Point gives a flavor of the Maine coast experience. It was a beautiful day with sunshine and cool temps when this picture was taken. Two days later, the weather changed and dropped 5″ of rain. Down the coast in Portland they had 7 or 8″. This day was ideal.

I want to see more.