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Topic: Optic axis

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	Optics - Search View - MSN Encarta
		The wavelength is the linear distance parallel to the axis between two points in the same phase, or occupying equivalent positions on the wave, for example, the distance from maximum to maximum in the case of a sine function representation.
		Unless light is traveling parallel to an axis of symmetry with respect to the structure of the crystals (the optic axis of the crystal), it is separated into two parts that travel with different velocities.
		The component with the electric vector vibrating in a plane containing the optic axis is the ordinary ray; its velocity is the same in all directions through the crystal, and Snell’s law of refraction holds.
	encarta.msn.com /text_761576625__1/Optics.html (5767 words)

	Optics - MSN Encarta
		The optic axis passes through the centre of a spherical lens or mirror and through its centre of curvature.
		If a narrow beam of rays travelling along the optic axis is incident on the spherical surface of a mirror or a thin lens, the rays are reflected or refracted so that they intersect or appear to intersect at a point on the optic axis.
		A narrow beam of rays travelling along the optic axis and incident on a concave mirror is reflected so that it intersects the radius at the focal point, or principal focus, halfway between the pole, or centre, of the mirror's surface and the mirror's centre of curvature.
	uk.encarta.msn.com /encyclopedia_761576625_2/Optics.html (1518 words)

	Two-dimensional scanning device with deflection scanning plane and optic axis maintained parallel - Patent 4327959
		Moreover, the scanning lens 3 is appropriately moved in synchronism with the minor deflection so that the intersection P.sub.o between the optic axis g and a scanning plane 4 is always positioned at the focus of the scanning lens 3.
		The rotational axis k-k' of the mirror 201 is orthogonal to the minor deflection rotation axis j-j' and its relative position is always invariable.
		A scanning lens 203 is an ordinary strain-free lens and the optic axis thereof is always coincident with the major deflection plane and the bodytube thereof is fixed to cross arms 204a and 204b.
	www.freepatentsonline.com /4327959.html (4925 words)

	Uniaxial Minerals
		Light traveling along the direction of this single optic axis exhibits the same properties as isotropic materials in the sense that the polarization direction of the light is not changed by passage through the crystal.
		The single optic axis is coincident with the c-crystallographic axis in tetragonal and hexagonal minerals.
		In this case the optic sign of the mineral is positive, and the uniaxial indicatrix is shown at the center of the crystal.
	www.tulane.edu /~sanelson/eens212/uniaxial_minerals.htm (2261 words)

	Multimode optic device - Patent 4168107
		The optic fiber device of claim 4 wherein said input optic fiber is coupled to said magnetizable film with its optic axis orthogonal to the plane of said magnetizable film at said join.
		The optic fiber device of claim 3 wherein said rotated multiplexing light beam is directed upon the selected one of said output optic fibers when said field H is of zero magnitude.
		The optic axes of output optic fibers 88a through 88h are aligned along the surface of cone 90, the major axis of which is colinear with optic axis 83 and the apex of which is oriented at the intersection 87, i.e., the join, of optic axis 83 and the exposed surface of film 82.
	www.freepatentsonline.com /4168107.html (3779 words)

	optic - definition by dict.die.net
		Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina.
		Optic angle (Opt.), the angle included between the optic axes of the two eyes when directed to the same point; -- sometimes called binocular parallax.
		In a normal eye it is in the direction of the optic axis that objects are most distinctly seen.
	dict.die.net /optic (174 words)

	Polarization
		The polarization of the extraordinary ray lies in the plane containing the direction of propagation and the optic axis, and the polarization of the ordinary ray is perpendicular to this plane.
		The direction of the optical axis for active crystals is the direction in which the difference in the indices for the 0 and E ray is a minimum.
		If a quartz plate is cut such that its optic axis is normal to the surfaces of the plate, and a ray of linearly polarized light is incident parallel to the optical axis, the ray will be separated into two collinear, circularly polarized rays.
	electron9.phys.utk.edu /optics421/modules/m8/polarization.htm (1655 words)

	[No title]
		We have already seen that a ray of light that comes in parallel to the optic axis will strike a concave mirror and be reflected toward the focal point-that is the definition of the focal point.
		The third principal ray is ray 3 that strikes a mirror at the optic axis.
		The optic axis is normal to the mirror so that ray leaves with an angle of reflection equal to the angle of incidence as indicated in the figure.
	www.eiu.edu /~ddavis/chapter_18/ch18_3.htm (1365 words)

	U.S. Patent: 5302979 - Ophthalmic apparatus capable of measuring the shape of a cornea - April 12, 1994
		3 shows the reflected images, on a two-dimensional image pickup element, of the four measuring light sources around the optic axis and a measuring light source provided on the optic axis reflected by the cornea of an eye to be examined.
		The light source 1 is disposed so as to emit a light always from on the optic axis and therefore, if the light sources 7a-7d are disposed symmetrically about the optic axis, the reflected image 1' will be considered to be the geometrical center relative to the reflected images 7a'-7d' of FIG.
		Now, the index mark 53 for measuring the eye refractive power always emerges from on the optic axis and therefore, if the index marks 70a-70d for measuring the shape of the cornea are disposed symmetrically about the optic axis, the cornea-reflected image 53' is considered to be the geometrical center of the cornea-reflected images 70a'-70d'.
	www.everypatent.com /comp/pat5302979.html (4900 words)

	Gray, Henry. 1918. Anatomy of the Human Body. Page 1001
		The term anterior pole is applied to the central point of the anterior curvature of the bulb, and that of posterior pole to the central point of its posterior curvature; a line joining the two poles forms the optic axis.
		The optic nerves follow the direction of the axes of the orbits, and are therefore not parallel; each enters its eyeball 3 mm.
		The outer wall of the bulb becomes thickened and invaginated, and the bulb is thus converted into a cup, the optic cup, consisting of two strata of cells (Fig.
	www.bartleby.com /107/pages/page1001.html (413 words)

	Laboratory 10
		Linearly birefringent, uniaxial crystalline materials are characterized by having a unique axis of symmetry, called the optic axis, which imposes constraints upon the propagation of light beams within the crystal.
		Two modes are permitted, either as an ordinary beam polarized in a plane normal to the optic axis, or as an extraordinary beam polarized in a plane containing the optic axis.
		A thin plate of birefringent crystal cut parallel to the optic axis is known as a wave plate.
	electron9.phys.utk.edu /optics421/Laboratories/Lab10.htm (883 words)

	Conoscopy of Uniaxial Minerals
		have their projections in the figure along axis AB so, along AB, the birefringence is constant and equal to the birefringence of the material examined but the retardation increases from center O to periphery A or B because the distance traveled by the light in the crystal increases as a function of the incidence angle.
		When the optic axis is colinear with the polarizer or analyzer directions, the field of view becomes almost completely dark as suggested by the parallelism of all indices of figure 1.
		For an illustration of the conoscopy of uniaxial minerals cut parallel to the optic axis, I have chosen the microscope quartz wedge as sample.
	users.skynet.be /jm-derochette/Conoscopy/Uniaxial_minerals_5.htm (1029 words)

	Biaxial Minerals
		At the points of maximum curvature of the isogyres are the two melatopes that mark the positions where rays that traveled along the optic axis emerge from the field of veiw.
		If one of the optic axes is oriented perpendicular to the stage, placing the microscope in conoscope mode will result in an optic axis interference figure.
		Optic axis figures probably provide the easiest method for determination of optic sign because grains with an orientation that would produce an OA figure are perhaps the easiest to find.
	www.tulane.edu /~sanelson/geol211/biaxial.htm (4378 words)

	[No title]
		The axis of symmetry is known as the optic axis; the axis of symmetry will pass through the center of curvature of the mirror.
		The optic axis passes through the center of curvature of the mirror and the focal point.
		The optic axis is an axis of symmetry.
	www.eiu.edu /~ddavis/chapter_18/ch18_2.htm (777 words)

	Dorlands Medical Dictionary
		It is positive when the visual axis crosses the cornea on the nasal side of the optic axis, as in most individuals; negative when the visual axis crosses the cornea on the temporal side of the optic axis; and nil when the visual axis and the optic axis coincide.
		on an anteroposterior radiograph of the distal humerus, the angle formed by a line perpendicular to the long axis of the humerus and a line tangential to the straight epiphyseal border of the distal lateral metaphysis, normally 70°–75°; a larger angle indicates cubitus varus and a smaller, cubitus valgus.
		an angle formed by two planes, one passing through the long axis of the epiphysis of the femur and the other through the long axis of the diaphysis; it is normally 130 degrees.
	www.mercksource.com /ppdocs/us/common/dorlands/dorland/dmd_a_41.htm (2591 words)

	Optic Nerve Sunglasses
		Optic Nerve Sunglasses are covered by warranty, for the original purchaser, against defects in Optic Nerve Sunglasses material and Optic Nerve Sunglasses workmanship for the lifetime of the product.
		Optic Nerve Sunglasses are impact resistant, they are not safety glasses, Optic Nerve Sunglasses are not shatterproof and do not provide unlimited protection against eye injury from severe impacts.
		Optic Nerve Sunglasses with carbon polarized lenses are laminated to strict optical standards to insure uniform thickness.
	www.sunglassesgiant.com /opnesu.html (189 words)

	WMAP Observatory_Radiometers
		Each primary is a (shaped) elliptical section of a paraboloid with a 1.4 m semi-minor axis and a 1.6 m semi-major axis.
		When viewed along the optic axis, the primary has a circular cross-section with a diameter of 1.4 m.
		Since the distance from the focal plane to the spacecraft symmetry axis is nearly the same for all the feeds, the high frequency feeds are extended with low loss corrugated waveguide, while the low frequency feeds are "profiled" to reduce their length, while limiting excitation of the TE_11 mode to less than -30 dB.
	map.gsfc.nasa.gov /m_mm/ob_techoptics.html (890 words)

	Variable optical attenuator with tunable wavelength selectivity patent invention (Site not responding. Last check: 2007-11-06)
		The attenuator of claim 14, wherein the transmission area is varied as the reflectors are moved back and forth in a direction perpendicular to the optic axis or revolved centering on an axis parallel to the optic axis by the driving units.
		The attenuator of claim 28, wherein the resonant wavelength satisfying the resonance condition is varied as the reflectors are moved back and forth in a direction parallel to the optic axis or revolved centering on an axis perpendicular to the optic axis by the driving units.
		The attenuator of claim 28, wherein the transmission area is varied as the reflectors are moved back and forth in a direction perpendicular to the optic axis or revolved centering on an axis parallel to the optic axis, and transmitted power is changed with a variation of the transmission area.
	www.freshpatents.com /Variable-optical-attenuator-with-tunable-wavelength-selectivity-dt20050901ptan20050191025.php?type=claims (983 words)

	Grain Orientation and Usable Interference Figures (Site not responding. Last check: 2007-11-06)
		As with uniaxial minerals, grains which will produce a centred to offcentred biaxial optic axis figure are easiest to identify because of their low interference colours due to the optic axis being vertical.
		If the birefringence for the mineral is low, grains with their optic axis vertical will remain extinct or nearly extinct as the stage is rotated.
		Optic axis figures are used for most routine work because these orientations produce interference figures where the both the optic sign and the 2V angle can be determined.
	www.brocku.ca /earthsciences/people/gfinn/optical/usable.htm (321 words)

	Halbo Optics Polarization Tutorial
		Linearly birefringent uniaxial crystalline materials are characterised by having a unique axis of symmetry, called the optic axis, which imposes constraints upon the propagation of light beams within the crystal.
		In general, components from synthetic quartz are limited to a maximum size in the direction of the optic axis of around 70mm, while natural quartz boules are available large enough to yield working apertures up to 100mm.
		Instead, the optic axis is the direction for which the two indices are closest: a beam propagates down it as two circularly polarized beams of opposite hand.
	www.halbo.com /pol_bir.htm (935 words)

	PHYS 319: Electron Optics
		The optic (z) axis is in the centre and perpendicular to the plane of the diagram.
		In practice, mechanical rotation is avoided by using two sets of quadrupole coils, oriented 45 degrees apart (as viewed along the optic axis); varying the relative strength of the currents in the two quadrupoles provides the same effect as a mechanical rotation of a single quadrupole.
		Curvature of field is not a problem in magnifying electron-optical systems; the angular deviation of electrons from the optic axis is small, resulting in a large depth of field such that the image remains acceptably sharp as the plane of viewing is moved along the optic axis.
	laser.phys.ualberta.ca /~egerton/e-optics/e-optics.htm (4959 words)

	Birefringence
		The propagation of light along the optic axis would be independent of its polarization; it's electric field is everywhere perpendicular to the optic axis and it is called the ordinary- or o-wave.
		The light wave with E-field parallel to the optic axis is called the extraordinary- or e-wave.
		Birefringent materials are used widely in optics to produce polarizing prisms and retarder plates such as the quarter-wave plate.
	hyperphysics.phy-astr.gsu.edu /hbase/phyopt/biref.html (562 words)

	Support - FAQs (Site not responding. Last check: 2007-11-06)
		Once you've cleaned your optic, place the optic in the mount it will be used in or wrap it in lens tissue and place it in its container right away.
		The tolerance for the centration of the aspheres (that is, the difference between the mechanical center of the lens and the location of the optical axis) is specified at 3 µm.
		The slow axis is always in the plane of incidence, perpendicular to the tilt-rotation axis.
	www.newfocus.com /support/faqs/optics_faqs.cfm (2746 words)

	Conoscopy of Biaxial Minerals
		The optic normal figures below were photographed from a thick Danburite crystal whose prism faces are nearly perpendicular to the optic axes.
		The angle between optic axes is approximately 90°.
		As the angle between the optic axes is close to 90°, it is not possible to determine from the curvature of the isogyres what is the direction of the acute bisectrix so the accessory plates cannot be used in this case to determine the optic sign.
	users.skynet.be /jm-derochette/Conoscopy/Biaxial_minerals_3.htm (256 words)

	Ophthalm-AUS - Oben's Ophthalmology Site
		The optic axis defines that direction through the crystal in which the differential absorption does not occur.
		The sheet would be cut so that the optic axis was parallel to the surface of the plate.
		When light enters such a plate, the polarisation with its axis perpendicular to the optic axis is strongly absorbed leaving the emerging beam to be polarised in the same orientation as the optic axis.
	home.iprimus.com.au /oben/absorb.htm (510 words)

	The Uniaxial Indicatrix
		If the ray travels down the optic axis, the cross section perpendicular to the ray is a circle, and the crystal appears isotropic.
		If the ellipse revolves around its major axis, the ellipsoid will be elongated along the rotation axis and the equatorial radius of the ellipsoid equals the minor axis of the ellipse.
		The ordinary ray is polarized in a plane perpendicular to the three-fold (optic) axis, and the extraordinary ray is polarized in the plane parallel to the three-fold (optic) axis.
	www.uwgb.edu /dutchs/petrolgy/IndicatrixU.HTM (1499 words)

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