TIR

TIR

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  TOTAL INTERNAL REFLECTION BY SOURABHKANT 2015
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  CERTIFICATE This is tocertify that Master Sourabh kant of Class:-XIISection:-A Roll No:-12 Exam Roll No;-9171XXX Has completed his PROJECT in the subject of PHYSICS as required according to the syllabus prescribed by the Central Board of Secondary Education for the academic session 2014-2015. V.N.TRIVEDI Teacher In-charge UN-KOWN DATE: 11-02-2015 Examiner’s Signature KAMLESH Principle
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  ACKNOWLEDGEMENT It gives megreat pleasure to express my gratitude towards our Physics TeacherMr. vivekanand trivedi for his Guidance, support and encouragement throughout the duration of my project. Without her motivation and help the successful completion of this project would not have been possible.
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  INDEX ● Theory OfTotal Internal Reflection ● Part 1: Total Internal Reflection Demo ● TIR: Interactive ● Part 2: Optical Fibres Demo ● Optical fiber: Interactive Theory Of Total Internal Reflection When light is incident upon a medium of lesser refractive index, the ray will bent away from the normal , so the exit angle will be greater than the incident angle. The exit angle will approach 90
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  degrees for aparticular angle of incidence, called Critical angle (q). For incident angles which is greater than critical angle, light will be reflected back to the incident medium itself. Such a phenomenon is called 'Total Internal Reflection.' The Critical angle can be calculated from the Snell’s law by setting the refraction angle to 90 degrees. n1*Sin q = n2 *Sin 90 1 q=Sin n2/n1. Here n1 and n2 are the refractive indices of medium 1 and medium 2 respectively. Total Internal Reflection takes place only when the following two conditions are met. 1. The light is incident to a less dense medium from a denser medium. 2. The angle of incidence is greater than the critical angle.
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  TIR Interactive The twomedia in the demo can be changed by selection. The light is shown as entered from medium1 into medium2 and corresponding incident ray and refracted ray is shown. When the incident angle is greater than critical angle, ' Total Internal Reflection ' will be printed on the window and the internally reflected ray will be shown. When we select the media, corresponding critical angle will be shown. When the refractive index of medium1 is less than that of medium2, 'No total internal reflection, because n1<n2 ' will be printed. As we change the direction of incident ray by dragging the incident angle slider, incident angle and corresponding refracted/reflected angle will be shown in the window.
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  Optical fibres Interactive Theuser can drag the light source up / down to change the angle at which light ray enters into fibre optics. When user click on the light source, light ray slowly hits at the entrance of fibres optics , and refracted into it. After that it undergoes total internal reflection continuosly. The user can pause the movement of light ray.
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  BIBLIOGRAPHY  NCERT CBSEBOOKS  HOW STUFF WORKS  SCICNCE FOR ALL