DICT.TW Dictionary Taiwan

 optic angle 名詞
 視角

 Op·tic Op·tic·al a.
 1. Of, pertaining to, or using vision or sight; as, optical illusions. [wns=2]
 Syn: -- ocular, optic, visual.
 The moon, whose orb
 Through optic glass the Tuscan artist views.   --Milton.
 2. Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina; the optic (or optical) axis of the eye. See Illust. of Brain, and Eye. [wns=3]
 3. Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment. [wns=1]
 Optic angle Opt., the angle included between the optic axes of the two eyes when directed to the same point; -- sometimes called binocular parallax.
 Optic axis. Opt. (a) A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces.  In a normal eye it is in the direction of the optic axis that objects are most distinctly seen. (b) The line in a doubly refracting crystal, in the direction of which no double refraction occurs.  A uniaxial crystal has one such line, a biaxial crystal has two.
 Optical circle Opt., a graduated circle used for the measurement of angles in optical experiments.
 Optical square, a surveyor's instrument with reflectors for laying off right angles.
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 An·gle n.
 1. The inclosed space near the point where two lines meet; a corner; a nook.
    Into the utmost angle of the world.   --Spenser.
    To search the tenderest angles of the heart.   --Milton.
 2. Geom. (a) The figure made by. two lines which meet. (b) The difference of direction of two lines. In the lines meet, the point of meeting is the vertex of the angle.
 3. A projecting or sharp corner; an angular fragment.
    Though but an angle reached him of the stone.   --Dryden.
 4. Astrol. A name given to four of the twelve astrological “houses.” [Obs.]
 5.  A fishhook; tackle for catching fish, consisting of a line, hook, and bait, with or without a rod.
    Give me mine angle: we 'll to the river there.   --Shak.
    A fisher next his trembling angle bears.   --Pope.
 Acute angle, one less than a right angle, or less than 90°.
 Adjacent or Contiguous angles, such as have one leg common to both angles.
 Alternate angles. See Alternate.
 Angle bar. (a) Carp. An upright bar at the angle where two faces of a polygonal or bay window meet. --Knight. (b) Mach. Same as Angle iron.
 Angle bead Arch., a bead worked on or fixed to the angle of any architectural work, esp. for protecting an angle of a wall.
 Angle brace, Angle tie Carp., a brace across an interior angle of a wooden frame, forming the hypothenuse and securing the two side pieces together. --Knight.
 Angle iron Mach., a rolled bar or plate of iron having one or more angles, used for forming the corners, or connecting or sustaining the sides of an iron structure to which it is riveted.
 Angle leaf Arch., a detail in the form of a leaf, more or less conventionalized, used to decorate and sometimes to strengthen an angle.
 Angle meter, an instrument for measuring angles, esp. for ascertaining the dip of strata.
 Angle shaft Arch., an enriched angle bead, often having a capital or base, or both.
 Curvilineal angle, one formed by two curved lines.
 External angles, angles formed by the sides of any right-lined figure, when the sides are produced or lengthened.
 Facial angle. See under Facial.
 Internal angles, those which are within any right-lined figure.
 Mixtilineal angle, one formed by a right line with a curved line.
 Oblique angle, one acute or obtuse, in opposition to a right angle.
 Obtuse angle, one greater than a right angle, or more than 90°.
 Optic angle. See under Optic.
 Rectilineal or Right-lined angle, one formed by two right lines.
 Right angle, one formed by a right line falling on another perpendicularly, or an angle of 90° (measured by a quarter circle).
 Solid angle, the figure formed by the meeting of three or more plane angles at one point.
 Spherical angle, one made by the meeting of two arcs of great circles, which mutually cut one another on the surface of a globe or sphere.
 Visual angle, the angle formed by two rays of light, or two straight lines drawn from the extreme points of an object to the center of the eye.
 For Angles of commutation, draught, incidence, reflection, refraction, position, repose, fraction, see Commutation, Draught, Incidence, Reflection, Refraction, etc.