1 / 22

Total Internal Reflection

Total Internal Reflection. Refraction Review. Refraction means bending. How does light go through glass anyway? Does NOT go through! Absorbed & Re-emitted countless times. Glass Molecules. Photon of light. Gulp!. Gulp!. Gulp!. Gulp!. BURP!. BURP!. BURP!. BURP!.

magee
Download Presentation

Total Internal Reflection

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

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

More Related