Experiment 10 Light as a Wave (Diffraction Grating) Objective:. Read your report and use spell check. If we look at the combined wavelets Estimating the wavelength of light using a diffraction grating 28/09/211 Ray box without lens, meter rules x2, diffraction grating with 300 lines per mm, voltage supply for ray box. \����;"c�v�f��>G~.f�[P��J����=ũ������� ��'��z��C�D���~O��% wGT��/0P�֠�=�QT,k��i-I���͘�)��+A��sx��+��q�OI���K��b������;H�f��H��]&������8�� �g����f�G���y�W�U&h�]��;l,��ʏٟ"�ԅQ�:���6�ՙ�M�I�0k(��9K�B���'��ሗH�Lt*�г5�� k�)#%3{$��u& -���#Y���([���q2���@Q� ��څ;^��H|b�Emf�J��ĳ5O�b�J����9�,�%�Q Apparatus: Diffraction Grating, Monochromatic Light Source, Spectrometer The spectrometer is set with its collimator towards the source of light. diffraction grating experiment The Discussion of Results section includes an explanation of how the collected data provide logical and reasonable support for the statement found in the Conclusion. Arrange for the beam to pass through the grating at normal incidence and meet the wall perpendicularly. Diffraction grating is an optical component having a periodic structure which can split and diffract light t several beams travelling in different directions. The wavelength of a spectral line can be very accurately determined with the help of a diffraction grating and spectrometer.. We place an open box with the CD in it with the recording side facing out on the mat. The diffraction gratings used in this experiment are plastic replicas of a master grating, made by pressing the plastic against the master grating, which acts as a mold. A diffraction grating is equivalent to such a system of many slits and can be used either in transmission or in reflection. If you wish to filter only according to some rankings or tags, leave the other groups empty. A recording on a CD is in the form of microscopic pits of different lengths that carry the information. Follow the specific instructions you are given about working safely with laser light. The gratings used in this experiment are replicas that have been cast in resin from a master grating. 1. A more detailed calculation of the grating constant is described in the task DVD as an Optical Grating. The wavelength of the emitted light is stated on the laser pointer. %�k�ǳ��r)C�=��I��~P=����%͔x�K Diffraction from a single slit. View Lab Report - Diffraction Grating Report.docx from ENGL 100 at Kenyatta University. After passing through grating rays forms the diffraction patterns which can be seen through telescope. The distance of the rows on a CD is 1600 nm. Experiment 9: Interference and Diffraction Answer these questions on a separate sheet of paper and turn them in before the lab 1. Diffraction grating has 600 lines/mm. It is an opportunity for […] This "super prism" aspect of the diffraction grating leads to application for measuring atomic spectra in both laboratory instruments and telescopes. Move the laser and double slit closer to the screen until you can just make out the fringe pattern clearly. Two simple experiments with a CD, which works quite well as a reflecting optical diffraction grating, are briefly described in this article. Experimental Setup and Gratings Measurements. Sign in. The condition for maximum intensity is the same as that for a double slit. In the grating, each narrow slit acts as a source of light diffracted through a large angle. Double slit In this part of the lab, you will perform the same experiment as in Part I but with double slits. To calculate sinα we need to know the distance y, which in our case is 9 cm. We can perform this experiment also with a DVD with the row distance 740 nm. The table of contents will list only tasks having one of the required ranks in corresponding rankings and at least one of the required tags (overall). The experiment uses a diffraction grating, diffraction scale, and the source of light in the following configuration. During diffraction on an optical grating, formed by a system of a large number of parallel slits with equal width, a monochromatic light wave of a wavelength λ creates an interference pattern on a screen. report. Experiment # 12 Experiment r l, THE DIFFRACTION GRATING SPECTROMETER Purpose: 1. The Discussion of Results should be clear, specific, and reasonable. Wave Nature of Light Objective: The purpose of this lab is to investigate interference, otherwise known as the diffraction of light. The Diffraction Grating OBJECTIVES: 1) Observe the interference pattern produced when laser light passes through multiple-slit grating (a diffraction grating). This is in the range of ordinary laboratory diffraction gratings. Lab Report on Diﬀraction and Interference Michael Goerz, Anton Haase 30. EQUIPMENT NEEDED: Optics Bench, Light Source, Ray Table Base, Component Holder, Diffraction Scale, Diffraction Plate, Diffraction Grating, Slit … where $$b$$ is the distance between two adjacent slits, called a grating constant or a grating period, and k = 0, 1, 2, … is the order of diffraction. ��=�(H�)G����-(���f�F*��" The wavelength of the laser beam was (6.13±0.40) ×10-7 m, and the unknown slit separation (1.73±0.02) ×10-6 m. From this the best estimate for the track pitch of the CD … 2,314 views. Phasor sum to obtain intensity as a function of angle. The experimental setup is very simple and consists in pointing the beam laser emitted from the He-Ne source on the diffraction grating. The diffraction pattern from a grating differs from the pattern from and individual object. ���YU׵*����\'���w�tO��ի�;�i���A���Qwߪ��Ɖ/l3S�e~��.Gu��R�,wK��J_7��xR��a�+�� i4I���k��JUǟ��+��'���'?Пz���M%w*WfW����!x�w7�����6ɥ�m��ڔ֯_9S��?Ud�d�԰LՎ�_ƌaE�� WB�!F ���:˭�h|�E>�*I���� ���jl]4YUU�@�dD7L~���yr�>UOo�n�bk���_�P�3� %�Y�u�.��,W�\�y��Z�}�>���1(z�L��"��X2����۬4� ����ی�ۢx�pP./��N~e�0|��+dm���S��YO��zV_7xK�T��X�,����yKB�����zYO?�2�g2��$�)喀��E"��`P�vV78M�U�XR����A&PvOR$[�Q�g��zE��������,X�Y�˂[�:�KQ���3�v_y�V����=�7���K݄�eo�പ��m;�R:��:ҭ���Sfe��CRX By example we will measure the wavelength of the laser, the spacing between tracks on a CD and the thickness of human hair WARNING! The directions of interference amplification are determined by the angle α, for which it applies (1) b sin α = k λ It is often a lengthy section of several sentences and even paragraphs. Furthermore, we can show the students that if you point a laser on a DVD, the first order maxima are more distant than in the experiment with a CD. %PDF-1.3 The gratings used in this experiment are replicas that have been cast in resin from a master grating. The spectral lines are observed on the diffraction scale. The wavelength of a spectral line can be very accurately determined with the help of a diffraction grating and spectrometer.. Experiment 9: Interference and Diffraction OBJECTIVES 1. This value differs by less than two percent of the measured values. The image below shows the two gratings we used in the experiment. The distance between the diffraction grating and the diffraction scale is carefully kept constant throughout all data collection. Diffraction gratings work both for transmission of light, as in Figure $$\PageIndex{3}$$, and for reflection of light, as on butterfly wings and the Australian opal in Figure $$\PageIndex{4a}$$. Place the laser approximately 4 m away from a large wall and place the diffraction grating in front of it. Note: Read your report and use spell check. Theory : Preliminary discussion: A prime example is an optical element called a diffraction grating. Let’s get a sense of the wave behavior from a number of slits combined. diffraction grating, supported at the same height as the laser beam metre ruler Procedure 1. $b=\frac{5.32\,\cdot10^{-7}}{\frac{0.09}{\sqrt{0.09^2+0.25^2}}}\, \mathrm{m} \doteq 1{,}57\,\cdot10^{-6}\, \mathrm{m} \doteq1570\, \mathrm{nm}$, \[ \lambda=1.6\,\cdot10^{-6}\cdot \frac{0.09}{0.09^2+0.25^2 }\,\mathrm{m} \doteq 542\,\mathrm{nm}. Choose required ranks and required tasks. The experiment undergone was an attempt to determine the track pitch of a CD and its separation between storage grooves by first determining the wavelength of a laser beam and the value for the separation of a diffraction grating. The diffraction-grating experiment is one where the measured answer (light wavelength) really should be close to the actual wavelength. When the plane waves of monochromatic light with wavelength fall on the grating with grating space d, secondary wavelets come from successive slits with angle to the incident beam … He-Ne-Laser The laser that we will use is a 4-level-laser. Experiment 10 Light as a Wave (Diffraction Grating) Objective:. A diffraction grating is made by making many parallel scratches on the surface of a flat piece of transparent material. The diffraction gratings used in this experiment are plastic replicas of a master grating, made by pressing the plastic against the master grating, which acts as a mold. This experiment was hard on the eyes. Laser pointer, compact disc in a plastic box, thick paper, scissors, mat, ruler, pencil. Be careful when adjusting the spectrum tubes or the power supplies. Follow the specific instructions you are given about working safely with laser light. Sign in . Consider a diffraction grating consisting of a very large number of slits. For the spectral color and order of diffraction of the line of the principal maxima on the right side and left side, measure and record the ɵ right and ɵ lef t respectively. Come browse our large digital warehouse of free sample essays. To measure the wavelengths of certain lines in the spectnrm of the mercury arc lamp. Diffraction Grating Lab Report. Turn on the He-Ne laser and adjust the slide so that the laser beam hits Pattern A of double slits. Add translations. The objectives are to (a) verify the wave nature of light by measuring its wavelength in an interference phenomenon, (b) learn about diffraction grating, and (c) measure the wavelengths of red and violet colors.. Equipment:. This experiment involves diffraction of light waves though a very small slit (aperture), and demonstrate that when light passes through the slit, the physical size … EXPERIMENT 2 Bragg Diffraction and Measurements of Crystal Unit Cells NOTICE: The X-ray apparatus must ﬁrst be explained and powered by the demonstrator before you use it. 15. To understand the diffraction, diffraction grating and how diffraction grating works with the help of basic diffraction grating equations and experimental studies. To explore the diffraction of light through a variety of apertures 2. The calculation will look like this: The wavelength of the laser is λ = 532 nm. Experiment 112-8 Grating and Prism Spectrometer Introduction Diffraction Gratings1: A master diffraction grating is made by ruling a large number of finely, closely spaced lines on a sheet of glass or metal with a diamond point cutter. Abdullah Alshati EXPERIMENT 14 I. @ �. Consider a diffraction grating … The result is that the grating acts as a dispersive optical component, with several advantages when compared to … Experiment 112-8 Grating and Prism Spectrometer Introduction Diffraction Gratings1: A master diffraction grating is made by ruling a large number of finely, closely spaced lines on a sheet of glass or metal with a diamond point cutter. Using the relation (1), where $$\sinα=\frac{y}{\sqrt{l^2+y^2}}$$, we can determine the laser wavelength and the grating constant, depending on what we choose as a known variable. ��3�Y%D�����R%�]����E�r&i(Z��x����L�b���$�#Ϯ�2i���9:�]O�v�̝�P�����9���t������熶a-oKX�-�;���Yu���t;�?�X1 ��&�+Ĺ^� The scratches are opaque but the areas between the scratches can transmit light. Physics 2054 Lab: Interference and the Diffraction Grating In this experiment, you will explore some of the wave properties of light. To become familiar with the use of a diffiaction grating specftometer 2. Experimental Set up . A diffraction grating is the tool of choice for separating the colors in incident light. Thus, a diffraction grating becomes a multitude of parallel slit sources … We point the laser beam approximately in the middle of the CD recording. Experiment no.1 . The emerging coloration is a form of structural coloration. 16 0. But 50% larger? During diffraction on an optical grating, formed by a system of a large number of parallel slits with equal width, a monochromatic light wave of a wavelength λ creates an interference pattern on a screen. It is often a lengthy section of several sentences and even paragraphs. ��KD!�&:���?#�U! �'Q��� �+����%i�D���O'�*��^l���&"�O1,�*���+��I\�?����!�2���CV This depends on the spacing of the grating and the wavelength of the incident light. Theory: Diffraction grating (transmission grating) is a sheet of glass plate with a large number of equally fine, closely spaced parallel lines ruled. 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