Meniscus Lenses are concave-convex lenses. The lens has a convex surface and a concave surface. If the curvature of the convex side is greater than the curvature of the concave side, the lens has a positive focal length and is used as a magnifier; if the curvature of the concave side is greater and the curvature of the convex side is less, then it is a negative meniscus lens, which can be used in place of other negative lenses. The curved moon lens is used to minimize spherical aberration to a greater extent, and can obtain a smaller focus and less aberration than the plano-convex lens to improve the image quality. When used in combination with another lens, a positively curved moon lens can shorten the focal length, thereby increasing the numerical aperture (NA) of the system without introducing significant spherical aberration. When used to converge collimated light, the convex side of the lens should face the light source.
Product details: positive curved moon lens characteristics:
A positively curved moon lens consists of two curved surfaces of similar radius of curvature with positive focal length. It is often used to reduce the focal length of the other lens, increase the numerical aperture, and other related applications. To reduce spherical aberration, the beam should be incident on the convex side of the lens for beam expansion or reduction or divergence collimation applications, and on the concave side for convergence collimation.
Positively curved moon lenses are primarily used to minimize spherical aberration. When used in combination with another lens, the positively curved moon lens reduces the focal length and increases the numerical aperture (NA) of the system without introducing significant spherical aberration. When used to converge parallel light, to minimize spherical aberration the convex surface of the lens should be oriented in the direction of the light source emission. Coated lenses are also widely used in visible and near infrared applications.
Negative Moon Bend Lens Characteristics:
Negative curved moon lenses are concave lenses, i.e., both sides of the lens are inwardly concave surfaces.
A negatively curved moon lens causes parallel light rays to diverge and appear to come from the focal point, so it has a negative focal length. This type of lens is often used to disperse light, to reduce the seeming size of an object, or to correct visual problems such as myopia.
A negatively curved moon lens causes light rays to bend outward as they pass through the lens, creating a negative spherical aberration. This causes it to produce a shrinking effect when imaging, making objects appear smaller.
In conclusion, positive and negative curved moon lenses have different uses and effects in optical applications. Positively curved moon lenses focus light and make objects appear larger, while negatively curved moon lenses disperse light and make objects appear smaller. They are key elements in optical systems and are used in a variety of applications including photography, eyeglasses, microscopes and telescopes.
(H-FK61 H-ZLAF H-LAF H-LAK ) Difficult (H-ZF H-F) Normal

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