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Possible Answers:
GAPS.
Last seen on: Thomas Joseph – King Feature Syndicate Crossword – Jan 21 2023
Random information on the term “Apertures”:
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In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light. By incorporating index of refraction in its definition, NA has the property that it is constant for a beam as it goes from one material to another, provided there is no refractive power at the interface. The exact definition of the term varies slightly between different areas of optics. Numerical aperture is commonly used in microscopy to describe the acceptance cone of an objective (and hence its light-gathering ability and resolution), and in fiber optics, in which it describes the range of angles within which light that is incident on the fiber will be transmitted along it.
In most areas of optics, and especially in microscopy, the numerical aperture of an optical system such as an objective lens is defined by
where n is the index of refraction of the medium in which the lens is working (1.00 for air, 1.33 for pure water, and typically 1.52 for immersion oil; see also list of refractive indices), and θ is the half-angle of the maximum cone of light that can enter or exit the lens. In general, this is the angle of the real marginal ray in the system. Because the index of refraction is included, the NA of a pencil of rays is an invariant as a pencil of rays passes from one material to another through a flat surface. This is easily shown by rearranging Snell’s law to find that n sin θ is constant across an interface.
Random information on the term “GAPS”:
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Gaps is the debut album from Monster Bobby. The title is ironic in that there are no actual “gaps” between songs on the record. It was released on CD in America on August 7, 2007 by Hypnote Recording Concern, followed by a release in the UK a week later on August 13.