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Understanding Total Internal Reflection and Refraction: The Science of Light Interaction

This review delves into the fascinating concepts of refraction and total internal reflection (TIR). Refraction is the bending of light as it passes through different mediums, such as glass, where it may be absorbed and re-emitted multiple times. We explore how light behaves at the critical angle, where it no longer passes through a surface but reflects back. This occurs when the index of refraction conditions are met. Various technologies utilize these principles, and we touch on important calculations and demonstrations, guiding you through the essential physics concepts of TIR.

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Understanding Total Internal Reflection and Refraction: The Science of Light Interaction

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Presentation Transcript

  1. Total Internal Reflection

  2. Refraction Review • Refraction means bending. • How does light go through glass anyway? • Does NOT go through! • Absorbed & Re-emitted countless times.

  3. Glass Molecules Photon of light Gulp! Gulp! Gulp! Gulp! BURP! BURP! BURP! BURP!

  4. Total Internal Reflection: Shine a light upwards out of water: • Some light will leave the water, • Some light will reflect back downwards at an equal angle.

  5. Total Internal Reflection • At a certain angle... • Light doesn’t go through the surface of the water anymore! • Demo...

  6. Critical Angle: Θc

  7. Occurs when: ni > nt andΘi > Θc

  8. ni > nt : Θi > Θc : “Occurs when:ni > nt andΘi > Θc”What does this mean?

  9. Finding the critical angle: • Sound familiar: • ni sinΘi = nr sinΘr • WhenΘr = 90, TIR occurs. • sin(90) = ___? • So........... • sinΘc = nr/ni • (Does everybody know where the sin-1 button is on their calculators?)

  10. Know of any technology that uses this principle???

  11. Total Internal Reflection HW • Read p. 403-405 • Do p. 410 # 10, 11, 16, 22, 23, 50-53

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