regular grating

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• Diffraction grating — A very large reflecting diffraction grating. In optics, a diffraction grating is an optical component with a periodic structure, which splits and diffracts light into several beams travelling in different directions. The directions of these beams …   Wikipedia

• Optical axis grating — Optical axis gratings (OAGs) are gratings of optical axis of a birefringent material. In OAGs, the birefringence of the material is constant, while the direction of optical axis is periodically modulated in a fixed direction. In this way they are …   Wikipedia

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• Talbot effect — thumb|right|325px|The optical Talbot Effect for monochromatic light, shown as a Talbot Carpet . At the bottom of the figure the light can be seen diffracting through a grating, and this exact pattern is reproduced at the top of the picture (one… …   Wikipedia

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• Diffraction — Computer generated intensity pattern formed on a screen by diffraction from a square aperture …   Wikipedia

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• Cloister — • The English equivalent of the Latin word clausura (from claudere, to shut up ) Catholic Encyclopedia. Kevin Knight. 2006. Cloister     Cloister      …   Catholic encyclopedia

• nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula …   Universalium

• Visual acuity — 20/15 and 20/15 vision redirect here. For other uses, see 2020 (disambiguation). Typical Snellen chart used for visual acuity testing. Visual acuity (VA) is acuteness or clearness of vision, which is dependent on the sharpness of the retinal… …   Wikipedia