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  2. Magnification - Wikipedia

    en.wikipedia.org/wiki/Magnification

    If the lens is held at a distance from the object such that its front focal point is on the object being viewed, the relaxed eye (focused to infinity) can view the image with angular magnification = Here, is the focal length of the lens in centimeters. The constant 25 cm is an estimate of the "near point" distance of the eye—the closest ...

  3. Lens - Wikipedia

    en.wikipedia.org/wiki/Lens

    If an object is located at the front focal point of the system, then its image made by the system is located infinitely far way to the right (i.e., light rays from the object is collimated after the system). To do this, the image of the 1st lens is located at the focal point of the 2nd lens, i.e., =.

  4. Focus (linguistics) - Wikipedia

    en.wikipedia.org/wiki/Focus_(linguistics)

    In (5), pitch accent is placed on grey and only the adjective grey is under focus. Historically, generative proposals made focus a feature bound to a single word within a sentence. Chomsky and Halle [17] formulated a Nuclear Stress Rule that proposed there to be a relation between the main stress of a sentence and a single constituent. Since ...

  5. Focus (geometry) - Wikipedia

    en.wikipedia.org/wiki/Focus_(geometry)

    These points of intersection are the defined to be the foci of C. In other words, a point P is a focus if both PI and PJ are tangent to C . When C is a real curve, only the intersections of conjugate pairs are real, so there are m in a real foci and m 2 − m imaginary foci.

  6. Eyepiece - Wikipedia

    en.wikipedia.org/wiki/Eyepiece

    The eyepiece is placed near the focal point of the objective to magnify this image to the eyes. (The eyepiece and the eye together make an image of the image created by the objective, on the retina of the eye.) The amount of magnification depends on the focal length of the eyepiece.

  7. Sentence function - Wikipedia

    en.wikipedia.org/wiki/Sentence_function

    The declarative sentence is the most common kind of sentence, and can be considered the default form: when a language forms a question or a command, it will be a modification of the declarative. A declarative states an idea (either objectively or subjectively on the part of the speaker; and may be either true or false) for the purpose of ...