Statistical analysis the labview data from the free response. Teaching the scientific method with instant snow polymer. Data table 3 refraction and refractive index experiment. Pdf measurement of the refractive index and thickness for lens by. The refractive index determines how much light is bent, or refracted, when entering a material. Thus n vac can be obtained by measuring the two angles. Method to make accurate measurements of refractive index. Collect a representative sample from a single stable process measure the sample calculate sample statistics point estimates for the mean and standard deviation. Many materials have a wellcharacterized refractive index, but these indexes depend strongly. To test the efficacy of the method, we performed a distance measurement using a stationary target and investigated the level of stability in the. Using a particular monochromatic light source, the apparatus is calibrated with water as the liquid. Term fall 17 tags physics, reflection and refraction.
When m 1 is a vacuum, n 1 is unity because v 1 becomes equal to c in equation 1. Refractive index and dispersion of fluorides and oxides pdf. The labview data from the free response experiment was used to find the period of the vibration system. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that. Refractive index of prism experiment by cbr youtube. Measuring refractive index with use of diffraction grating. Thorough but studentfriendly approach to experimental design that aims to stimulate, rather than intimidate. You will test these relationships in this set of experiments using a laser pointer as the source of the light ray. Example experiment report for phys 342l purdue university. Place a rectangular glass slab on the white sheet of paper fixed on a drawing board. Pdf study the effective a temperature and concentration. Experimental design for the life sciences paperback.
Reactions of copper experiment 6 free download as pdf file. This is the cause of chromatic aberration in simple lenses. Experimental stress analysis has been traditionally appliedthrough a direct or forward approachfor solving structural mechanical problems as an alternative and complementary methodology to. Teaching the scientific method with instant snow this is a wonderful lab activity to give students a basic understanding of the steps involved in the scientific method. Thus, 2 where n vac is the absolute refractive index of m 2. Recently, metamaterials that display negative refractive index a property not. Refractive index using hollow cell see the theoretical data below, based from snells law, using n1. Pdf experimental stress analysis for materials and structures. Measuring the refractive index of a material is one of the most fundamental optical measurements, and one of the most practical. Refractive index measurement is actually a measurement of the speed of light in a medium. Refractive index of water using convex lens and plane. The homemade light intensity detector uses an led and multimeter, which are relatively. Free download exploring research 8th edition by neil j.
Measuring refractive index instructions for new teachers and non specialist teachers. Ppt reflection, refraction and diffraction powerpoint. Pdf in this work we use a diffraction grating to calculate the wavelength inside a transparent material of parallel plane faces, with the. That is, blue light is bent more by glass or plastic lenses and red light is bent less.
Immediately after hydrating the snow polymer, have students touch the expanded material. The temperature dependence of the refractive index of water article pdf available in journal of physics d applied physics 118. It should be slightly warm to the touch, as the reaction between the water and the. Data table 3 refraction and refractive index experiment incident angle. It turns out that n is smaller for long wavelength red light and larger for short wavelength blue light.
The refractive index also depends on the wavelength colour of the light ray. Push the boundaries of knowledge in biology, chemistry, medicine, physics, computer science, paleontology, economics, engineering, neuroscience, and more. Department of psychology, university college london, uk 3. This book will help you understand basic terms and concepts about scientific experiments. Travelling microscope is a compound microscope that is fitted on the vertical scale. It carries a vernier scale along the main scale and can be moved upward or downward. Measuring refractive index values with use of diffraction grating.
Reflection and refraction 17 be scattered away from its original direction figure 2. Pearson exploring science year 7 summary free ebook download or read online on. Monroe director,bureauofeducationalresearch and maxd. Determination of the refractive index of a liquid using. Ppt introduction to fluorescence microscopy powerpoint. If the same experiment is realized inside a material with n index, then the wavelength. To measure the acceleration of an object during free fall with the help of a pendulum. Determination of the index of refraction using a laser pointer euhou.
Detection of liquid concentrations by optical means was already known in antiquity. Note that this report does not represent a real experiment and thus should be used only as an example of style and form. Determination of refractive index of transparent liquids using the first. In view of the coronavirus pandemic, we are making live classes and video classes completely free to prevent interruption in studies. Finding refractive index using travelling microscope for. Although altmetrics and other webbased alternative indicators are now commonplace in publishers websites, they can be difficult for research evaluators to use because of the time or expense of the data, the need to benchmark in order to assess their values, the high proportion of zeros in some alternative indicators, and the time taken to calculate multiple complex indicators. The index of refraction of glass varies with its composition and with the wavelength of the light incident on the glass. Experimental verification of laws of refraction and. An experiment does not require having access to instruments. The refractive index, the ratio of speed of light from one medium to another is a physical measurement used to help determine the identity and purity of a liquid compound. Fau physics lab ii exp 11 fau physics lab ii phy2049l lab.
Pdf a new confocal measurement for lens refractive index and thickness is. To determine the refractive index, we measured the deflection of a beam of microwave radiation as the beam passed through the prismshaped sample. Negative refractive index metamaterials sciencedirect. The refractive index is a unitless number, between 1. An experimental study on fear of public speaking using a virtual environment mel slater1, davidpaul pertaub1, chris barker2, david clark3 1. Repeat the experiment for different values of angle of incidence. This was done by taking the difference in the time between two peaks in the displacement data.
Refractive index lab worksheet example answers pdf. We used beams of light to find the radii of curvature for a double concave lens, then used them, the known index of refraction, and the lens makers formula to calculate the overall focal length of the lens. Pdf the present experiment discusses, presumably the most basic method, for determination of refractive. Many people asked which side the lanes will be added. Download limit exceeded you have exceeded your daily download allowance. Results in the digital portion of the lab, the toluene. Relation between angle of prism and angle of deviation. The index of refraction is, in general, a function of the wavelength of the light. Use labview to plot the frequency response, sampling at 5 steps decade.
A combination of holotomographic microscopy and computer vision allows the label free observation of novel shape and dry mass dynamics of mammalian organelles such as lipid droplets and the investigation of complex organellar motion using pattern matching and homography analysis. A line drawn in the direction of propagation of light is called a ray of light. In this video lecture i have discussed about class 12 physics practical how to find refractive index of water using convex lens and plane mirror. In physics, refraction is the change in direction of a wave passing from one medium to another. Determination of the refractive index of a glass block. Re ection and refraction 3 in this equation, n i is the index of refraction of the incident medium, n r is the index of refraction of the refraction medium, and critical is the critical angle for total internal re ection. This fiber fp microcavity sensor has different responses to the change of temperature and liquid refractive index, it can be. In this experiment, the independent variable is the angle of incidence, and the dependent variable is the angle of refraction. Refractive index measurement guide free download mettler.
Determination of the refractive index of a liquid using the apparent depth method. Pdf the temperature dependence of the refractive index. Ordinary crown glass, when illuminated by white light, has a refractive index of 1. Compare the n value to what you obtained by using the minimum deviation angle. We can define refraction as bending of light rays as they move from one medium. Depending on the type of uv lamp and output power, the uv7000 adhesive curing time will range from 20 seconds to 4 minutes or more. The only undergraduate textbook devoted to experimental design for the life sciences, making this essential aspect of the research process readily understandable. Lab report introduction to find the refractive index for the two liquid compounds, hexane and toluene, a digital and the abbe analog refractometer were used. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Experiment is an online platform for funding and sharing scientific discoveries. Research methods experimental design a set of notes suitable. Measuring refractive index instructions for new teachers. To determine refractive index and dispersive power of material of prism using spectrometer.
Experimental verification of a negative index of refraction. Introduction to fluorescence microscopy a free powerpoint ppt presentation displayed as a flash slide show on id. The actual experiment reports will usually be longer as there is more material to cover. The absolute refractive index of a medium is the ratio of the speed of electromagnetic radiation in free space to the speed of the radiation in that medium. Your experimental results should be precise enough to. Wiley series in probability and mathematical statistics includes index.
Refractive index using hollow cell and percent light transmission measurement. Light reflection and refraction notes for class 10. In other media the speed of light is lower than this value, and the refractive index, r. Salkinds exploring research, 8th edition makes research methods accessible for students. An experimental study on fear of public speaking using a.
Similar to our optical illusion science experiment, light. Pdf the refractive index of pure water is measured at temperature rang 2550oc and four different concentration of nail solution. There are also weaker dependencies on temperature, pressurestress, etc. Simultaneous measurement of temperature and refractive. Negative refraction was determined by a snells law experiment using a. The relative refractive index is the ratio of the speed of light in one medium to that in the adjacent medium. Following these recommendations will allow you to achieve the best results in refractive index measurement.
Standard refractive index measurements are taken at the yellow doublet sodium d line, with a wavelength of 589 nanometers. We then used these values to calculate the index of refraction for the liquids and compared them to accepted values. The primary difference between the true experiment and quasiexperimental designs is the degree of control that the researcher has over the subjects and variables of the study. The physics classroom grants teachers and other users the right to print this pdf document and to download this pdf document for private use. Extremely highaccuracy correction of air refractive index using two. The top plate had a pivot in the center, about which an attached xband microwave.
Imagebased analysis of living mammalian cells using labelfree 3d. Pdf determination of refractive index of optically transparent. To determine refractive index of a glass slab using a travelling microscope. Bonus problem 5 marks to be added to your experiment mark if you solve it. You will test these relationships in this set of experiments using a laser pointer as the source of. Re ection and refraction objective equipment list theoretical. The aim of this experiment is to find the refractive index of a glass prism. Click here to learn the concepts of relation between angle of prism and angle of deviation, refractive index of materials from physics.
Different glass types exhibit different dispersion curves, as shown below. Many materials have a wellcharacterized refractive index, but these indexes depend strongly upon the frequency of light. Cutler summarized the meeting by saying, most people were in favor of the four lanes expansion. The ultra low viscosity of this adhesive reacts extremely well to the new higher power uv lamps on the market. Pdf method to make accurate measurements of refractive index. Schubert 1 refractive index of various substances gemstones agate 1. For more information on our new high power uv curing lamps, visit. In the 28 days of stem series, this weeks topic is stem challenges so we thought we would introduce a science challenge that tricks your eyes. B 6, 43704379 1972 silver is often used as a coating material for broadband mirrors for visible and infrared spectral regions. Under clipping action, the shape of the input waveform is changed.
Clamping circuits, however, set either the positive or negative. Lab 11 dispersion from a prism and index of refraction. Is defined as the ratio of velocity of light in vacuum to the velocity of light in a substance at same wave length. Belle plaine family medicine showcased its newly remodeled facilities during an open house june 10. Below is an experiment to determine refractive index of a glass slab using a travelling microscope. Holotomographic microscopy htm is a labelfree microscopy method reporting the fine changes of a cells refractive indices ris in three. Physics lab report 2 refractive index prism documents. Refractive index ebooks read ebooks online free ebooks. All books are in clear copy here, and all files are secure so dont worry about it. A short, very precise and clear introduction to experimental research, created by. Students determine the refractive index of a liquid with a simple technique using a semicircular hollow block. The refractive index of glass is a function of the wavelength of light, a property known as.
Lab index of refraction of glass newton local schools. The 20 paradigms enable replicating important experiments and modify them in 100s of ways without programming for individual projects. Control is much easier to achieve in the laboratory than in the field. Opti 20 2l geometrical and instrumental optics lab 91. Department of computer science, university college london, uk 2. Three practical field normalised alternative indicator. Imagebased analysis of living mammalian cells using label. Example experiment report for phys 342l the following report is written to help students in compiling their own reports for phys 342l class. Practical on how to measure the refractive index of a perspex or glass block. We suggest that you experiment with your current uv lamps to find the optimum curing time for the type of joint being bonded.
The purpose of experiment 11 was to analyze the dispersion spectrum from a prism and measure the index refraction n of a prism using snells law, minimum deviation from a prism, total internal reflection, brewsters angle and apparent depth. Find the halfpower frequencies by adjusting the scales of the graph to zoom in. The experiment was performed using a commercially available tunable diode laser system that was designed. Interferometric measurement of the resonant absorption and. In this refraction experiment, the prismshaped samples were placed between the two circular aluminum plates. Refractive index a refractometer measures the extent to which light is bent i.
Product description presents the basics of research in the social and behavioral sciences in an informative and studentfriendly way. This scattering is caused by the interaction of light with small particles, even atoms or molecules, within the material. Step by step instructions with lots of images included on how to set up the experiment, as well as slide show of images showing how to set up the experiment for your class. An activity that includes collection and analysis of data and interpretation of the results for the purpose of managing a process. Light reflection and refraction notes for class 10 formulas download pdf. Refractive indices of lithium niobate pdf free download. In this experiment, a beam of microwaves was directed onto the flat portion of the wedge sample, passing through the sample undeflected, and then refracting at the second interface. In 2001, a snells law experiment was performed on a wedgeshaped metamaterial designed to have a negative index of refraction at microwave frequencies. For light, the refractive index n of a material is more often used than the wave phase speed v. Then they predict the refractive index of a material a pyrex glass tube by matching it with the known refractive index of a liquid using the percent light transmission measurement.
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