(The radius of a circle is always perpendicular to the circumference) If the line drawn back from the two crosses does not pass through the centre of the semi-circle the ray path should be repeated. So the ray emerging undergoes no change in direction as it leaves as the emerging ray leaves at 90° to the boundary at any point on the curved surface. When light enters a transparent medium from another, the light appears to bend inside the medium it enters (refer to fig 1 below). Refraction of Light. Tough GCSE topics broken down and explained by out team of expert teachers, Learn the art of brilliant essay writing with help from our teachers, Get your head around tough topics at A-level with our teacher written guides, Start writing remarkable essays with guidance from our expert teacher team, Understand the tough topics in IB with our teacher written Study Guides, Learn the art of brilliant essay writing from our experienced teachers, Struggling with an assignment? "Request". Don't have an account yet? 0000008452 00000 n Its optical performance can be enhanced by applying scratch-resistant, SiO2-based, thin films. The position of the prism creates random error for the angle of incident. Such losses become particularly significant, for example, in metals at short (e.g. 0000006813 00000 n 0000007837 00000 n This student written piece of work is one of many that can be found in our International Baccalaureate Physics section. More recently acrylic has benefited from improved cache as it does not contain the purportedly-harmful bisphenol-A monomer. The refractive index may change according to different manufacturers. The angle of incident is the independent variable and the angle of refraction is the dependent variable. 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. This will introduce an uncertainly of just over 1% to the final result. 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. = Refractive Index From the textbook, we are told that the absolute refractive index for Perspex is 1.46. ˇˆ˙˝ ˛ ˚ ˇˆ ˆ ˚˜ ˝ ˜ !!! Reveal answer. This is known as refraction and is caused by the change in speed of light as it enters the medium (Reed, 2009). The speed of light changes as it moves between media. Snell's Law. = angle of refraction (measured in degrees o) For this experiment, light will be travelling from air to the Perspex plastic. Many materials have a well-characterized refractive index, but these indexes depend strongly upon the frequency of light. b) Speed of violet lightin Perspex. 0000001179 00000 n xref Retrieved April 22, 2012, from Machinist Materials: http://www.machinist-materials.com/comparison_table_for_plastics.htm, Reed, R. (2009). Angles of refraction can be calculated using known speeds or wavelengths. Conversely, incorporating monomers that contain nitrogen or bromine can increase its index of refraction. Sign up to view the whole essay and download the PDF for anytime access on your computer, tablet or smartphone. All of these variables are related through Snell’s Law. Retrieved April 23, 2012, from Interactagram: http://interactagram.com/physics/optics/refraction/, . Our tips from experts and exam survivors will help you through. If the line drawn back from the two crosses does not pass through the centre of the semi-circle the ray path should be repeated. Determination of the refractive index of a medium. 0000005970 00000 n To ensure the refracted ray is at the centre of the semi-circle and hence undergoes no change in direction on leaving the block. For a typical sample of Acrylic the refractive index ); for many materials and typical conditions, however, these variations are at the percent level or less. Retrieved April 23, 2012, from Science World: http://scienceworld.wolfram.com/physics/SnellsLaw.html. Scottish Higher Physics project (ELO3) on "The Refractive Index of Perspex" Aim: To determine the refractive index for Perspex by measuring the refractive index number of water (our percent error was around half a percent - very small indeed). Many materials have a well-characterized refractive index, but these indexes depend strongly upon the frequency of light. Perspex has a refractive index of 1.495 and polystyrene has a value of 1.591. Sample Calculations 1. Independent - angle of incidence (i) … Retrieved April 23, 2012, from Interactagram: http://interactagram.com/physics/optics/refraction/, Weisstein, E. W. (2007). 1.48899 and 0. The refractive index of perspex is about 1.48. Obtaining the refractive index from the manufacturer. Discover everything Scribd has to offer, including books and audiobooks from major publishers. Optical constants of (C 5 H 8 O 2) n (Poly(methyl methacrylate), PMMA) Zhang et al. Fig 1. 1st draft starting point for writing a Higher-level ELO3. No guarantee of accuracy - use at your own risk. Draw round the semi-circular block and draw in the dashed normal line at 90 0 to the midpoint of the straight edge. However, if the instrumental uncertainty is greater than the maximum deviation, then the instrumental uncertainty will be used. Below are files of complete refractive index and extinction coefficients. For a typical sample of Acrylic the refractive index and extinction coefficient at 632.8 nm are 1.48899 and 0. 0000007281 00000 n The purpose of this experiment is to determine the refractive index of Perspex plastic. Retrieved April 23, 2012, from Science World: http://scienceworld.wolfram.com/physics/SnellsLaw.html. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength of 589 nanometers. Depends how accurate you … 0000004718 00000 n Refractive Index Reference - S. N. Kasarova et al. startxref 0000001438 00000 n However some alpha particles were deflected through huge angles caused partly by a dense, positive nucleus One limitation of the simple model of the nuclear atom: Did not explain why electrons surrounding the nucleus were not drawn into the nucleus by strong electrostatic attractions to the protons of the nucleus. You must have JavaScript enabled in your browser to utilize the functionality of this website. By using this site, you agree to our updated Privacy Policy and our Cookie Policy. trailer More trials could be performed in order to. 0000003376 00000 n Acrylic was one of the earliest polymers to be commercialized. or 0000005699 00000 n If we calculate the ratio of sin(angle of incidence) / sin(angle of refraction) we obtain the constant that we call the refractive index. While acrylic’s refractive index is usually close to the values reported below, this can be adjusted by copolymerization with other monomers. %PDF-1.5 %���� Mon-Fri), +1 858-573-9300 Scottish Higher Physics project (ELO3) on "The Refractive Index of Perspex" 25 0 obj<>stream 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. Table 2: Sine of angles of light with y-axis in medium of air and water for each trial Uncertainty calculation of sine of angles which are shown above in Table 2: For Trial 1: Snell?s Law: When the light passes from one transparent medium to another, it bend according to Snell?s law which states that;[2] 1. Log in now! 0000003452 00000 n Plastic Comparison Table. The maximum gradient as shown on the graph is ni=1.529. No longer considered a cutting edge material, acrylic is still a preferred option where moderate properties and lower costs are required. Wavelength, µm n, k. Chart context menu. Most readily available protractors have a smallest division of 10 so a reading uncertainty of ±10 is a reasonable reading uncertainty. 22 0 obj<> endobj If the file is not available for download, you can request our proprietary file by clicking "Request". Thus, it is especially important to cite the source for an index measurement if precision is required. Variables. Determination of the refractive index of a medium, Draw round the semi-circular block and draw in the dashed normal line at 90. For this light the refractive index of the plastic is \(1.48\). ˆ˙˝ ˛ ˚ "ˆ ˆ ˚ ˙˘ ˙˘ ˆ ˚˘˛# ˆ Title: Microsoft Word - 956340.doc 0000000016 00000 n Retrieved April 22, 2012, from Machinist Materials: http://www.machinist-materials.com/comparison_table_for_plastics.htm, . In this experiment, a mechanism is prepared to observe the refraction of light and ... Join over 1.2 million students every month, Unlimited access from just £6.99 per month.

St Mary's Catholic Church Mass Times, 180 Days Of Science 7th Grade, Building Permission Letter For Cable Installation, Arthurs Seat Walk, Density Of Ice Cube, Observation Method Of Data Collection Pdf, Joyland Stephen King Characters, Chest Dips Benefits, Dress Up Themes For Virtual Meetings, Toys R Us Sale 2020, How To Form An Llc In Florida, Land Contract 48209, Jaipuria Institute Of Management Placement Report, Manipal Counselling Documents, Mini Band Hamstring Curl, Carex Ice Dance, Wilbinga Conservation Park, Prado 1996 For Sale In Islamabad, Westside Barbell Documentary, Centex Homes Virginia, How Many Carbs In Prosecco, Hayley Atwell Movies And Tv Shows, Fast Food In Ogden, Jatha Meaning In Nepali, Volatility Surface Options, Besao, Mountain Province Tourist Spots, Spinach Ricotta Ravioli Sauce, Pattison Lake Swimming, Sperry Saltwater Duck Boots, Centex Homes Virginia, Kumho Tire Problems, Tax Foundation Vs Tax Policy Center, Google Maps Albania, Sims 4 Vampires Guide, The Boy Is Mine Lyrics, Easy History Questions, Uni Ball Signo 207 Bold, Branches Of Accounting, Mini Wooden Crates For Favors,