A spherical lens and an axicon are combined to form an optical system producing a ring-shaped focalization pattern. The diameter of the ring in the focal plane depends on the angle of the axicon, on its dielectric index, and on the focal length of the spherical lens. The diffractional ...
The diameter of a simple lens is called the linear aperture, and the ratio of this aperture to the focal length is called the relative aperture. This latter quantity is more often specified by its reciprocal, called thef-number. Thus, if the focal length is 50 mm and the linear aperture...
The diameter of a simple lens is called the linear aperture, and the ratio of this aperture to the focal length is called the relative aperture. This latter quantity is more often specified by its reciprocal, called the f-number. Thus, if the focal length is 50 mm and the linear aperture...
Fresnel lens - lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length intraocular lens - an artificial lens that is implanted into the eye of someone to replace a damaged natural lens or someone who has had a cataract removed ...
Related to spherical:Spherical astronomy,spherical lens,spherical equivalent spher·i·cal (sfîr′ĭ-kəl, sfĕr′-)alsospher·ic(-ĭk) adj. 1. a.Havingtheshapeof asphere;globular. b.Havingashapeapproximatingthatof asphere. 2.Of orrelatingto asphere. ...
Spherical refracting lenses based upon the Luneburg lens offer unique capabilities for radioastronomy, but the large diameter of lens required for the Square Kilometre Array (SKA) means that traditional lens materials are either too dense or too lossy. We are investigating a composite dielectric ...
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The size of PDMS lens is 4 mm (height) × 18 mm (diameter). The effective aperture is 10 mm. Filled liquid is NaCl solution, which has a density of 1.17 g/cm3 and refractive index of 1.372. Figure 3 The schematic diagram and physical image of the proposed PDMS lens. (a) ...
the resolution of the electron lens, and hence that of the microscope. The image resolution in the TEM is governed by the ability of the objective lens to image the object, while in the STEM the image resolution is governed by how much beam current we can put into a small image of the...
The size of PDMS lens is 4 mm (height) × 18 mm (diameter). The effective aperture is 10 mm. Filled liquid is NaCl solution, which has a density of 1.17 g/cm3 and refractive index of 1.372. Figure 3 The schematic diagram and physical image of the proposed PDMS lens. (a) ...