A4 Fresnel lens

The Fresnel lens is a thin, flat optical lens invented by French physicist Augustin Fresnel in 1822. Unlike a traditional lens, it’s made of a series of narrow concentric grooves glued to the surface of a lightweight plastic sheet. Each groove has the same focal length, but is at a slightly different angle to the next in order to concentrate the light at one point. Each groove can be thought of as a small individual lens that bends the light.

Benefits

The advantage of the Fresnel lens is that it greatly reduces the thickness of a conventional lens. The use of plastic instead of glass makes the lens thinner, lighter and more economical, while maintaining the same performance. This also makes the Fresnel lens flexible and unbreakable.

Use

Put the A4 Fresnel lens in front of the sun and the light will be concentrated in a point at the focal distance of 30 cm, enabling you to heat and/or light all types of material instantly. It can also be used to start a fire or barbecue, solar cooking or solar pyrography.

Dimensions: 21 x 27 cm.