Definitionadj. having or localized centrally at a focus
Last update: July 1, 2015
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The focal point of the whole discussion was not very clear. [Please select]
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He inserted a slip of metal, of variable breadth, at the focus of the telescope, and observed at what part it exactly covered the object under examination; knowing the focal length of the telescope and the width of the slip at the point observed, he thence deduced the apparent angular breadth of the object. [Please select]
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What is meant by the focus or focal length of a lens. [Please select]
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109) that rays coming from a point in the principal focal plane emerge as a parallel pencil. [Please select]
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B is a double convex lens, which has a focal length of twenty inches. [Please select]
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Nevertheless, he is becoming a focal point for opposition. [Please select]
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The conductor's intentions were still at the focal point of her mind. [Please select]
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, the coarse grinding must be continued, unless a longer focal length is wanted. [Please select]
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Instead, there are two focal points, called the _foci_, as you will see presently. [Please select]
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The magnifying power of a compound microscope depends upon the focal length of the object-glass (or glass nearest the object), upon the length of the tube, and the power of the eye-piece. [Please select]
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With regard to object-glasses, those of shortest focal length have the highest powers, and the longest eye-pieces have the lowest powers. [Please select]
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