Ads
related to: focus factorwiserlifestyles.com has been visited by 100K+ users in the past month
Search results
Results From The WOW.Com Content Network
The stress concentration factor, , is the ratio of the highest stress to a nominal stress of the gross cross-section and defined as [3] = Note that the dimensionless stress concentration factor is a function of the geometry shape and independent of its size. [4]
The Bahtinov mask is a device used to focus small astronomical telescopes accurately. Although masks have long been used as focusing aids, the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov ( Russian : Павел Бахтинов ) in 2005.
The f-number N is given by: = where f is the focal length, and D is the diameter of the entrance pupil (effective aperture).It is customary to write f-numbers preceded by "f /", which forms a mathematical expression of the entrance pupil's diameter in terms of f and N. [1]
The Gaussian function has a 1/e 2 diameter (2w as used in the text) about 1.7 times the FWHM.. At a position z along the beam (measured from the focus), the spot size parameter w is given by a hyperbolic relation: [1] = + (), where [1] = is called the Rayleigh range as further discussed below, and is the refractive index of the medium.
Depth of focus is a lens optics concept that measures the tolerance of placement of the image plane (the film plane in a camera) in relation to the lens. In a camera, depth of focus indicates the tolerance of the film's displacement within the camera and is therefore sometimes referred to as "lens-to-film tolerance".
Edmund Rumpler's 1921 Tropfenwagen was the first series-produced aerodynamically designed automobile, before the Chrysler Airflow and the Tatra 77.. The drag coefficient is a common measure in automotive design as it pertains to aerodynamics.
Ad
related to: focus factor