Making a traditional glass lens requires a lot of experience, skill, and patience grinding a piece of glass to the required shape, and is not for the casual experimenter. Making a glass Fresnel ...

The unique history of the Crooked River Lighthouse’s lens in Carrabelle, Florida. The Crooked River Lighthouse’s Executive Director, Steve Allen, shares with us the unique qualities of the ...

Needless to say, the views we get through modern lenses are a lot more realistic ... This became the de facto theory for light, known as the Huygens-Fresnel principle until Maxwell’s ...