Objectives

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Possible Answers: ENDS.

Last seen on: LA Times Crossword 24 May 2018, Thursday

Random information on the term “Objectives”:

In optical engineering, the objective is the optical element that gathers light from the object being observed and focuses the light rays to produce a real image. Objectives can be a single lens or mirror, or combinations of several optical elements. They are used in microscopes, telescopes, cameras, slide projectors, CD players and many other optical instruments. Objectives are also called object lenses, object glasses, or objective glasses.

The objective lens of a microscope is the one at the bottom near the sample. At its simplest, it is a very high-powered magnifying glass, with very short focal length. This is brought very close to the specimen being examined so that the light from the specimen comes to a focus inside the microscope tube. The objective itself is usually a cylinder containing one or more lenses that are typically made of glass; its function is to collect light from the sample.

Microscope objectives are characterized by two parameters: magnification and numerical aperture. The magnification typically ranges from 4× to 100×. It is combined with the magnification of the eyepiece to determine the overall magnification of the microscope; a 4× objective with a 10× eyepiece produces an image that is 40 times the size of the object. Numerical aperture for microscope lenses typically ranges from 0.10 to 1.25, corresponding to focal lengths of about 40 mm to 2 mm, respectively.


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Random information on the term “ENDS”:

Recreational drug use is the use of a psychoactive drug to induce an altered state of consciousness for pleasure, by modifying the perceptions, feelings, and emotions of the user. When a psychoactive drug enters the user’s body, it induces an intoxicating effect. Generally, recreational drugs are in three categories: depressants (drugs that induce a feeling of relaxation and calm); stimulants (drugs that induce a sense of energy and alertness); and hallucinogens (drugs that induce perceptual distortions such as hallucination). In popular practice, recreational drug use generally is a tolerated social behaviour, rather than perceived as the serious medical condition of self-medication. However, heavy use of some drugs is socially stigmatized.

Recreational drugs include alcohol (as found in beer, wine, and distilled spirits); cannabis and hashish; nicotine (tobacco); caffeine (coffee and black tea); and the controlled substances listed as illegal drugs in the Single Convention on Narcotic Drugs (1961) and the Convention on Psychotropic Substances (1971) of the United Nations. What controlled substances are considered illegal drugs varies by country, but usually includes methamphetamines, heroin, cocaine, and club drugs. In 2009, it was estimated that about 3% to 6% of people aged 15 to 65 had used illegal drugs at least once (149 to 270 million).

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