
	Where results make sense

Topic: Convex lens

Related Topics

Concave lens

	Lens (optics) - Wikipedia, the free encyclopedia
		If the lens is biconvex or plano-convex, a collimated or parallel beam of light travelling parallel to the lens axis and passing through the lens will be converged (or focused) to a spot on the axis, at a certain distance behind the lens (known as the focal length).
		The beam after passing through the lens appears to be emanating from a particular point on the axis in front of the lens; the distance from this point to the lens is also known as the focal length, although it is negative with respect to the focal length of a converging lens.
		where n is the refractive index of the lens material, n' is the refractive index of the medium which the lens is in and d is the distance along the lens axis between the two surfaces (known as the thickness of the lens).
	en.wikipedia.org /wiki/Lens_(optics) (2334 words)

	The Columbia Encyclopedia, Sixth Edition: lens @ HighBeam Research (Site not responding. Last check: 2007-10-08)
		LENS [lens] device for forming an image of an object by the refraction of light.
		The lens of the eye is known as a crystalline lens.
		Examples are the double convex lens (both surfaces curved outward as in the simple magnifying glass), the plano-convex (one flat and one convex surface), and the concavo-convex (one surface concave, the other convex).
	www.highbeam.com /library/doc0.asp?DOCID=1E1:lens&refid=ip_encyclopedia_hf (750 words)

	convex lens
		A convex lens is thicker at its centre than at its edges, and is used to correct long-sightedness (hypermetropism).
		The distance between the lens and the point at which all the rays of light converge (the focal point) is called the focal length.
		The lens formula is used to work out the position and nature of an image formed by a lens: 1/u + 1/v = 1/f, where u and v are the distances of the object and image from the lens, respectively, and f is the focal length of the lens.
	www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0031042.html (373 words)

	COMP 235: Ray Tracer
		Before describing the lens characteristics of a thick lens, the equations of the "ideal" thin lens are compared to the "realistic" thick lenses (as shown in the "ray tracer" applet.
		A lens is defined it's focal length, which is the distance from the lens that lights rays from an infinite far away object converge to after passing though the lens.
		The depth-of-field is from the lens to the bunny.
	www.cs.unc.edu /~dorianm/academics/comp235/lenstrace (894 words)

	Convex lens - Wikipedia, the free encyclopedia
		A convex lens, or converging lens, is a lens that is curved outward (convex): the ends are narrow and the middle is wide.
		There are three kinds of rays drawn from an object, through the lens, and after the lens used to pinpoint focus of an image: Rays entering parallel to the axis will pass through the focal point on the image side of the lens.
		Light passing through the point one focal length from the lens along the axis will be diffracted so that it is parallel to the axis, and light passing through the center will not be diffracted at all.
	en.wikipedia.org /wiki/Convex_lens (177 words)

	Focal Length of a Lens (Site not responding. Last check: 2007-10-08)
		The distance from the lens to that point is the principal focal length f of the lens.
		The lens strength in diopters is defined as the inverse of the focal length in meters.
		The principal focal length of a lens is determined by the index of refraction of the glass, the radii of curvature of the surfaces, and the medium in which the lens resides.
	hyperphysics.phy-astr.gsu.edu /hbase/geoopt/foclen.html (278 words)

	Edmund Optics
		When using a lens as a tool to convey light from an emitter to a detector, it is important to consider what is known as throughput (TP), a quantitative measurement of transmitted light energy.
		The radius of a lens surface is considered positive if the distance from the vertex of the surface on the optical axis to the center of curvature of the surface is measured from left to right and negative if measured from right to left.
		Implicitly, the projection lens solution defines part of the condenser lens system; the distance of the condenser lens system to the projector lens system is at least as great as the distance from the reticle to the projector lens system (F2).
	www.edmundoptics.com /techSupport/DisplayArticle.cfm?articleid=267 (2059 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		The relatively small increase of the aberrations introduced by the plano-convex lens according to the invention is accompanied by a relatively large increase in the tolerance for sideways movements of the lens.
		The preferred distance measured in micrometers is substantially equal to 3Rdgap, where R is the radius of the convex surface in millimetres and dgap the distance between the planar surface and the transparent layer in micrometers.
		The axial thickness of the plano-convex lens is defined by the gap thickness, the thickness of the transparent layer, the radius of curvature and the magnification of the plano-convex lens.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=98/53450.981126&ELEMENT_SET=DECL (3165 words)

	Focal Point - Convex Lenses (Site not responding. Last check: 2007-10-08)
		First, a convex lens is one which is thicker in the center than it is near the edges.
		The focal point of a convex lens is the point where light rays parallel to the axis are brought to a point.
		The lens does not have to have the same curvature on both sides for this to be true, and it doesn't depend on the direction the light takes entering the lens.
	www.gunn.palo-alto.ca.us /~cbakken/p1A/optics/obookshelf/cvfocal.html (883 words)

	To Calculate the Focal Length & Power of a Convex Lens
		It was position such that the plane of the paper was perpendicular to the axis through the lens and the light bulb (the principal axis of the lens).
		v from the lens, and the lamp moved along the lens’ principal axis until an image of the filament of the lamp was sharply focused on the screen.
		Varying this quantity meant that the distance from the object to the lens was also varied to maintain the sharp focus of the image on the screen.
	website.lineone.net /~alex.meaden/essays/physlens.htm (1696 words)

	Lab 5.1.3
		A convex lens is called a converging lens because rays parallel to the principal axis converge at the focal point.
		The distance, OF, is known as the focal length of the concave lens.
		In the case of the diverging lens the parallel rays of light appear to diverge from F and it is known as a virtual focus.
	www.usd.edu /phys/labs/Optics/5_1_3/5_1_3c.html (994 words)

	Fourier transform optical apparatus and optical information - Patent 5627678
		Further, a facet of the Fourier transform optical apparatus of the present invention comprises a first convex lens arranged near the display means of the input image, a concave lens, and a second convex lens arranged near the composite focal plane of the first convex lens and concave lens.
		Namely, a second convex lens 4 of focal length f3, a first concave lens 3 of focal length f2 and a first convex lens 2 of focal length f1 are arranged from the side of the second spatial light modulator 5 toward the photodetector 28.
		Concave lens 3 is a lens composed of concave lens 31 and meniscus lens 32.
	www.freepatentsonline.com /5627678.html (5201 words)

	The Convex Lens
		The most commonly-seen type of lens is the convex lens.
		This type of lens is often used for close examination of small objects, such as rare stamps or coins.
		This further bends the rays of light towards the centerline of the lens (which coincides with the green light ray in the figure).
	www.play-hookey.com /optics/lens_convex.html (331 words)

	Convex
		A convex lens is a circular or spherical surface.
		Because a convex lens deflects light rays towards the axis normal to its plane, known as the optical axis and hence converge them towards each other, it is known as a positive lens.
		where f is the focal distance of the lens or reflecting surface, a is the distance between the object and the plane of the lens or reflecting surface and b is the distance between the image and the plane of the lens or reflecting surface.
	trueforce.com /Optics/Convex.htm (626 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		This is followed by a positive meniscus lens, a plano-convex lens, a doublet lens with overall biconvex profile, a triplet lens with overall biconvex profile, and doublet lens with overall meniscus profile and having the convex surface facing the object side.
		A prior lens of Becton Dickinson, the assignee of the present invention, has a plano-convex flint glass lens followed by a single meniscus lens, and a pair of doublets, the first having a plano-convex overall shape and the second being biconvex.
		The near hemispheric shape of the plano- convex lens (total axial thickness of the lens plus the attached plate of identical crown glass material being 4.715 mm compared to the 4.66 mm radius of curvature of the convex surface 5, of difference of less than 1.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/19265.030306&ELEMENT_SET=DECL (2154 words)

	Melles Griot Optics Guide - Lens Combinations (Site not responding. Last check: 2007-10-08)
		As shown in the earlier discussion on lens shape, the best-form singlet lens for use at infinite conjugate ratios is generally nearly plano-convex.
		This useful drawing, which can be scaled to fit a plano-convex lens of any focal length, can be used to estimate the magnitude of its spherical aberration, although lens thickness affects results slightly.
		To understand why this configuration improves performance so dramatically, consider that if the biconvex lens were split down the middle, we would have two identical plano-convex lenses, each working at an infinite conjugate ratio, but with the convex surface toward the focus.
	www.mellesgriot.com /products/optics/fo_4.htm (579 words)

	The Physics Classroom
		The method of drawing ray diagrams for double convex lens is described below.
		The description is applied to the task of drawing a ray diagram for an object located beyond the 2F point of a double convex lens.
		The goal of a ray diagram is to determine the location, size, orientation, and type of image which is formed by the double convex lens.
	www.physicsclassroom.com /Class/refrn/U14L5da.html (1879 words)

	Exercise, Image Formation by a Converging Lens (Site not responding. Last check: 2007-10-08)
		is the distance from the object to the lens, and f is the focal distance of the lens.
		As the object is moved closer toward the lens, the image distance tends to zero from the negative side.
		Although the rays of light do not intersect, the mind perceives them to be coming from a point on the other side of the lens (this is shown by the dark green lines), which is infact the location of the virtual image.
	www.physics.uoguelph.ca /applets/Intro_physics/kisalev/java/clens (386 words)

	Convex/Concave Lenses Science Lesson Plan, Thematic Unit, Activity, Worksheet, or Biology or Chemistry Teaching Idea
		Goals: The students will see how both convex and concave lenses work, some of the different uses of both types of lenses and do an experiment showing how these lenses work.
		1) Convex- A lens which is thicker in the middle than on the ends.
		4) The thicker the middle of the lens the shorter the focal length.
	www.lessonplanspage.com /ScienceConvexConcaveLenses69.htm (753 words)

	The Physics Classroom
		The fact that a double convex lens is thicker across its middle is an indicator that it will converge rays of light which travel parallel to its principal axis.
		The fact that a double concave lens is thinner across its middle is an indicator that it will diverge rays of light which travel parallel to its principal axis.
		If a symmetrical lens is thought of as being a slice of a sphere, then there would be a line passing through the center of the sphere and attaching to the mirror in the exact center of the lens.
	www.physicsclassroom.com /Class/refrn/U14L5a.html (760 words)

	Convex Lens - Compare Prices, Reviews and Buy at NexTag - Price - Review
		The lens is 89 mm long, 15 mm thick, and 25 mm across the beam axis.
		A convex lens framed in an architectural bronze trim, the Statford wall sconce has a no-nonsense approach to outdoor lighting.
		A convex lens framed in an architectural silver trim, the Statford wall sconce has a no-nonsense approach to outdoor lighting.
	www.nextag.com /convex-lens/search-html (255 words)

	Math Forum - Ask Dr. Math (Site not responding. Last check: 2007-10-08)
		Date: 11/09/98 at 07:33:54 From: Karl Pudniks Subject: Convex lens algebra A focused image of an object produced by a convex lens and is projected onto a screen at 3x magnification.
		Then the screen is moved 20cm, and the object moved a certain distance until another focused image is produced at 2.5x magnification.
		The trickiest part of this problem for me was that it isn't clear whether the screen was moved closer to the lens or farther from it, so I had to try it both ways and see which one gave a solution.
	mathforum.org /library/drmath/view/56311.html (397 words)

	lensid
		It’s the shape of the lens that determines whether the lens is converging or diverging.
		Light passes through this lens as if it were a plano lens.
		The purpose of this lab is to determine the types of several lenses and test their vergance.
	www.rit.edu /~vjrnts/courses/OFT/labs/lens_identification (251 words)

	DOUBLE CONVEX LENS
		All light rays passing through the center of the lens (4 inch position) and are not affected.
		There are an infinite number of light rays from the head of the arrow to the tail of the arrow passing through the center of the lens.
		Where you have light rays passing through the center of the lens, and crossing rays that pass through the Focal point, you are in the process of forming a Real Image.
	users.snip.net /~veraandscience/Light/D_convex.html (972 words)

	Making a Water Lens
		A lens is a curved piece of clear glass or plastic used to focus light.
		Share information about bifocals, where the top lens is for distance and the bottom lens is for close-up and reading.
		Listen to them for evidence that they understand the concept of a lens, the principles of refraction, and the difference between concave and convex lenses.
	www.reachoutmichigan.org /funexperiments/agesubject/lessons/h2olense.html (434 words)

	Simulated Optics Experiments: Single Lens - Succeed in Physical Science
		A convex lens is one in which the center is wider than the ends.
		A concave lens has the center "caved in" and is wider at the edges.
		A concave lens is wider at the edges than at the middle.
	www.school-for-champions.com /science/experiments/simopticslens.htm (1294 words)

	Lenses
		Any ray aimed at a focal point will be bent parallel to the principal axis.
		F on the right of the lens is the only one shown.
		A 6.0 cm object is placed 30.0 cm from a lens.
	sol.sci.uop.edu /~jfalward/lenses/lenses55.html (158 words)

	SELFOC Plano-Convex (PC) Lens
		Plano-Convex Lens features a curved surface on one end facet, designed to reduce spherical aberration in the lens.
		There are two coupling schemes: the single lens system and the confocal (two-lens) system.
		When AR coating is specified for one side only, e.g., A1, D1, etc., the coating is applied to the convex side unless otherwise specified by the customer.
	www.nsgeurope.com /plano.shtml (262 words)

	Relationship Between U and V For a Convex Lens
		Then, firstly we will move the lens holder with the lens, and the object so that the distance from the object to the lens is 16cm.
		We will then shine the light onto the object and measure the distance from the lens to the image on the screen and record this result in centimeters.
		In each case the distance v from the lens to the image on the screen will be recorded.
	www.coursework.info /i/3835.html (648 words)

	Tracker Trail - Fire From Ice - Rob Bicevskis
		Therefore, if we were to build two lenses identical in size and shape, one made from glass and one made from water, the lens made of glass would have higher magnification and would do a better job at starting a fire.
		Since the lens we are trying to make has a spherical shape, if we go back to math class, we can define a sphere as a surface that is defined by a constant radius.
		The ice lens can be removed along with the frame and then inverted to machine the other side.
	www.trackertrail.com /survival/fire/ice/rb/rbfirefromice3.html (2312 words)

Try your search on: Qwika (all wikis)