refractive index of perspex

1st draft starting point for writing a Higher-level ELO3. Mon-Fri), +1 858-573-9300 . The refractive index may change according to different manufacturers. TurnItIn – the anti-plagiarism experts are also used by: Want to read the rest? 0000002924 00000 n supplying the same power, it is kept constant by using the same power supply in each trial. Why must the incident ray be directed to the centre of the straight edge? {\displaystyle k} Calculating uncertainty for angle of refraction using maximum deviation: The maximum deviation will be used to calculate the uncertainty for the average angle of refraction. and extinction coefficient 0000003376 00000 n 0000003147 00000 n Retrieved April 23, 2012, from Science World: GCSE resources with teacher and student feedback, AS and A Level resources with teacher and student feedback, International Baccalaureate resources with teacher and student feedback, University resources with teacher and student feedback. Angles of refraction can be calculated using known speeds or wavelengths. Wavelength, µm n, k. Chart context menu. The maximum gradient as shown on the graph is ni=1.529. (24 Hr. trailer The angle of incident is the independent variable and the angle of refraction is the dependent variable. Mon-Fri), To request the proprietary encrypted file please enter your Filmetrics® system information, Your serial number could not be found. Retrieved April 23, 2012, from Interactagram:, Weisstein, E. W. (2007). Get Full Access Now Uncertainty = Average values – Highest value, Uncertainty = Average value – Lowest value, Since both values of the maximum deviation is less than the instrumental value of 1o. No guarantee of accuracy - use at your own risk. visible) wavelengths, and must be included in any description of the refractive index. xref Below are files of complete refractive index and extinction coefficients. Diagram of light (from Britanica Inc), Where:                 = refractive index of the medium where light is leaving (no units), = refractive index of the medium where light is entering (no units), = angle of incident (measured in degrees o), = angle of refraction (measured in degrees o). 0000005087 00000 n Below are files of complete refractive index and extinction coefficients. The refractive index of air is 1. %PDF-1.5 %���� Discusses method of gathering results, and an anal…, 90% found this document useful (10 votes), 90% found this document useful, Mark this document as useful, 10% found this document not useful, Mark this document as not useful, Save Physics - Refractive Index of Perspex For Later. 0000004718 00000 n This will introduce an uncertainly of just over 1% to the final result. Sign up to view the whole essay and download the PDF for anytime access on your computer, tablet or smartphone. The gradient of this graph is the refractive index of the material of the semicircular block. No longer considered a cutting edge material, acrylic is still a preferred option where moderate properties and lower costs are required. We also know that the Refractive Index for light leaving the medium is the reciprocal of the Refractive Index for light entering the medium. This student written piece of work is one of many that can be found in our International Baccalaureate Physics section. Retrieved April 22, 2012, from Machinist Materials:, . Set up the raybox with an incident ray at 10° to the normal line and mark in the refracted ray with two pencil crosses at shown. Material: Index: Vacuum: 1.00000: Air at STP: 1.00029: Ice: 1.31: Water at 20 C: 1.33: … Don't have an account yet? Determination of the refractive index of a medium, Draw round the semi-circular block and draw in the dashed normal line at 90. at 632.8 nm are Religious, moral and philosophical studies. All Rights Reserved. +1 858-573-9300 Depends how accurate you … Already have an account? This is called Snell's Law. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Created with Highcharts 5.0.14. The position of the prism creates random error for the angle of incident. Learn the basics with our essay writing guide, To determine the index of refraction of Perspex plastic. The angle of incident is the independent variable and the angle of refraction is the dependent variable. Calculate or find: a) Speed of red lightin Perspex. There are also weaker dependencies on temperature, pressure/stress, etc., as well on precise material compositions (presence of dopants, … 0000003452 00000 n Read about our approach to external linking. : Thomas P. Seward III and Terese Vascott; The American Ceramic Society, Westerville, Ohio, 2005, C. R. Garcia, J. Correa, D. Espalin, J. H. Barton, R. C. Rumpf, R. Wicker, V. Gonzalez, ", Corrective lens#Ophthalmic material property tables, Meyrowitz, R, A compilation and classification of immersion media of high index of refraction, American Mineralogist 40: 398 (1955), "Silicone Fluids: Stable and Inert Media", "Silicon Carbide (SiC) - Optical properties", "Refractive Index and Dispersion of Fluorides and Oxides", "Optical properties and electronic structure of oxidized and reduced single-crystal strontium titanate", "Optical constants of Ta2O5 (Tantalum pentoxide)", "Optical properties and London dispersion interaction of amorphous and crystalline {SiO2} determined by vacuum ultraviolet spectroscopy and spectroscopic ellipsometry", "Fluorinert Electronic Liquid FC-72 Product Information", "Optical properties of Teflon® {AF} amorphous fluoropolymers", "Visible to near-infrared refractive properties of freshly-excised human-liver tissues: marking hepatic malignancies", "A review of solid–fluid selection options for optical-based measurements in single-phase liquid, two-phase liquid–liquid and multiphase solid–liquid flows", "Experimental and theoretical determination of the electronic structure and optical properties of three phases of {ZrO2}", International Association for the Properties of Water and Steam, Luxpop: Index of refraction values and photonics calculations,, Articles with dead external links from March 2020, Articles with permanently dead external links, Creative Commons Attribution-ShareAlike License, This page was last edited on 3 November 2020, at 01:00. What is the expected reading uncertainly of the angles? Scottish Higher Physics project (ELO3) on "The Refractive Index of Perspex" Draw round the semi-circular block and draw in the dashed normal line at 90 0 to the midpoint of the straight edge. Each material in the database has refractive index listed as a function of wavelength over a range typically required for thin-film thickness measurement. All of these variables are related through Snell’s Law. The purpose of this experiment is to determine the refractive index of Perspex plastic. This maximum is determined by subtracting the highest and lowest value from the average angle of refraction and the magnitude of this result will be used as the uncertainty. For this experiment, light will be travelling from air to the Perspex plastic. b) Speed of violet lightin Perspex. This will introduce an uncertainly of just over 1% to the final result. Fig 1. Perspex has a refractive index of 1.495 and polystyrene has a value of 1.591. For a typical sample of Acrylic the refractive index and extinction coefficient at 632.8 nm are 1.48899 and 0. Create one now! Retrieved April 23, 2012, from Interactagram:, . This is known as refraction and is caused by the change in speed of light as it enters the medium (Reed, 2009). JavaScript seem to be disabled in your browser. Log in now! 0000006210 00000 n The graph above (Source1) shows the acrylic glass methyl methacrylate, also knows as Perspex.2 It can be seen that the refractive index found out in this experiment, ni=1.421 0.108, is not directly on the possible set of values, but considering the error, it is still within the range. This may have caused random error. c) Angle X°shown in the diagram below. 0 0000000816 00000 n Remove the raybox and semi-circular block then measure angles of incidence and refraction from the normal using a protractor. Sometimes these are referred to as "hardcoats". 2020: Mitsubishi; n,k 0.4-20 µm 0000008968 00000 n 0000005970 00000 n Many materials have a well-characterized refractive index, but these indexes depend strongly upon the frequency of light. Aim: To determine the refractive index for Perspex by measuring the The refractive index of water is about 1.33 (But both values depend slightly on wavelength and temperature.

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