0000005970 00000 n b) Speed of violet lightin Perspex. The maximum gradient as shown on the graph is ni=1.529. (24 Hr. Discover everything Scribd has to offer, including books and audiobooks from major publishers. There are also weaker dependencies on temperature, pressure/stress, etc., as well on precise material compositions (presence of dopants, … The length was measured and then the only thing to do was make sure that the ramp wouldn?t move. This causes refraction. 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. 0000004074 00000 n The refractive index may change according to different manufacturers. 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. Depends how accurate you … The position of the prism creates random error for the angle of incident. Mon-Fri), To request the proprietary encrypted file please enter your Filmetrics® system information, Your serial number could not be found. 0000001567 00000 n The angle of incident is the independent variable and the angle of refraction is the dependent variable. Example using results from the angle of incident of 10o, However, the uncertainty for this trial has no decimal places (refer to Sample Calculations 2), ∴ The average angle of refraction is 6o for the angle of incident of 10o. We also know that the Refractive Index for light leaving the medium is the reciprocal of the Refractive Index for light entering the medium. 0000000816 00000 n Already have an account? ˆ˙˝ ˛ ˚ "ˆ ˆ ˚ ˙˘ ˙˘ ˆ ˚˘˛# ˆ Title: Microsoft Word - 956340.doc All Rights Reserved. 0000007281 00000 n Retrieved April 23, 2012, from Science World: http://scienceworld.wolfram.com/physics/SnellsLaw.html. No longer considered a cutting edge material, acrylic is still a preferred option where moderate properties and lower costs are required. If the file is not available for download, you can request our proprietary file by clicking To ensure the refracted ray is at the centre of the semi-circle and hence undergoes no change in direction on leaving the block. supplying the same power, it is kept constant by using the same power supply in each trial. trailer Refractive Index Reference - S. N. Kasarova et al. Log in now! 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. 0000003147 00000 n Retrieved April 23, 2012, from Science World: http://scienceworld.wolfram.com/physics/SnellsLaw.html. 2020: Mitsubishi; n,k 0.4-20 µm The speed of light changes as it moves between media. If we calculate the ratio of sin(angle of incidence) / sin(angle of refraction) we obtain the constant that we call the refractive index. This will introduce an uncertainly of just over 1% to the final result. As both the mark and the light rays were thick. 0000001042 00000 n Scottish Higher Physics project (ELO3) on "The Refractive Index of Perspex" Snell's Law. Conversely, incorporating monomers that contain nitrogen or bromine can increase its index of refraction. ����@�ISL7ڋ�,��Q�K[`3*6�Ŝ�|��*��|�. Calculate or find: a) Speed of red lightin Perspex. Sample Calculations 1. Many materials have a well-characterized refractive index, but these indexes depend strongly upon the frequency of light. 0000001179 00000 n %PDF-1.5 %���� c) Angle X°shown in the diagram below. You must have JavaScript enabled in your browser to utilize the functionality of this website. Get Full Access Now Sometimes these are referred to as "hardcoats". Not the one? Extinction coefficient [ i ] k =. Calculating average for the angle of refraction: The average value of the angle of refraction cannot exceed the amount of decimal places of the uncertainty. We also know that the Refractive Index for light leaving the medium is the reciprocal of the Refractive Index for light entering the medium. 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. Discusses method of gathering results, and an analysis of improvements, as well as a comparison to the book value. Below are files of complete refractive index and extinction coefficients. "High temperature glass melt property database for process modeling"; Eds. This will introduce an uncertainly of just over 1% to the final result. No guarantee of accuracy - use at your own risk. Independent - angle of incidence (i) … 0000002553 00000 n Created by teachers, our study guides highlight the really important stuff you need to know. Tab-delimited data file for unrestricted use: © Copyright 2020 KLA Corporation. %%EOF TurnItIn – the anti-plagiarism experts are also used by: Want to read the rest? Fig 1. This is called Snell's Law. Conclusion The refractive index of Perspex, acquired through calculation, was 1.48, and through the graph, the value was 1.38. = Refractive Index From the textbook, we are told that the absolute refractive index for Perspex is 1.46. 0000004718 00000 n Uses include a wide variety of transparent coverings (both protective and decorative), e-beam photoresists and a plethora of medical applications. 1.48899 and 0. Why must the incident ray be directed to the centre of the straight edge? at 632.8 nm are More trials could be performed in order to. Material: Index: Vacuum: 1.00000: Air at STP: 1.00029: Ice: 1.31: Water at 20 C: 1.33: … Refractive Index Database The table below contains links to refractive index data for common materials. More recently acrylic has benefited from improved cache as it does not contain the purportedly-harmful bisphenol-A monomer. Aim: To determine the refractive index for Perspex by measuring the The Perspex plastic prism was constantly moved as the angle needed to be measured. The refractive index of water is about 1.33 (But both values depend slightly on wavelength and temperature. (24 Hr. Scottish Higher Physics project (ELO3) on "The Refractive Index of Perspex" Create one now! {\displaystyle k} 0000001438 00000 n Plastic Comparison Table. The refractive index of perspex is about 1.48. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength of 589 nanometers.

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