Various Applications of Plano Concave Lenses

Application of Plano concave Lenses on Peepholes on Doors

The peephole allows you to see outside and judge whether you need to open the door. This is done through the principle of a convex lens and three plano-concave lenses, ensuring that wide-angle light can form a clear image through the plano-concave lenses. The convex lens acts as what we call an eyepiece. This design allows us to see only from the inside, and the outside cannot see, which greatly guarantees our safety, so many door frames now use this principle.

Application of Plano concave Lenses on Telescopes

The telescope is characterized by a convex objective lens and a plano-concave eyepiece at a specific distance. The plano-concave lens faces the eye and is located in front of the focal point of the objective lens. This setting can create a smaller upright virtual image. Although the largest version can be up to three feet long and achieve 30 times magnification, this design is limited by a narrow field of view and blurred images, leaving room for future development.

Plano concave Lenses in Flashlights

In flashlights, the application of plano-concave lenses is used as beam expanders to enhance the illumination of a larger area. When light passes through the plano-concave lens, they slow down and refract, resulting in a wider field of view. Many flashlights allow the user to adjust the distance between the light source and the plano-concave lens, further fine-tuning the divergence of the beam.

Laser Systems – Beam Expanders

For high-power laser applications, Mok Optics’ plano-concave lenses are made from advanced materials such as fused silica or various infrared materials. These lenses have high damage thresholds and low thermal expansion coefficients, making them suitable for rigorous use. Optical coatings, such as anti-reflective (AR) coatings, are common in laser systems. In beam expander arrangements, plano-concave lenses are used in conjunction with other lenses, such as bi-convex lenses, to amplify a collimated laser beam. The concave surface should face the light source to minimize spherical aberration, ensuring optimal performance in precision applications.

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