Astro optics pvt. Ltd. An iso 9001 : 2000 certified company manufactures various types of optical components. As a part of that magnifiers are used to "magnify" objects. The magnifying power depends on the focal length of the lens. The larger the focal length, the less is the magnification. As the magnification increases , the field of view decreases and the lens diameter also decreases.
Magnifiers can be of many types, a simple plano convex lens is also a magnifier but has a limited performance capability. It is useful for general viewing and small magnifications.
Two lenses with an air space in between give a slightly better performance in terms of field of curvature.
Triplet lenses are preferred for high magnifications and they give very good performance in terms of flatness of field, distortion and distortion. They are used for inspection of very small objects.
Cold mirror - reflects the visible wavelength spectrum and transmits the infrared
