Please sit together in pairs: Mike A. and Da Barney and Heran Thomas and Joe Serruto

1. Mikhail and Matt R. • Valerie and Grant • Kevin and Evan • Ally and Rebecca • Matt M. and Katherine • Morgan and Joe Sebek • Laura and Quanbiao • Lauren and Charlie • Mikey O. and Lu • Hannah and Ashkan • Jim and Naichen • Nick and Dale • Ben and Disha • Nik and Efrain • Please sit together in pairs: • Mike A. and Da • Barney and Heran • Thomas and Joe Serruto • Glenn and Yiran • Ann and Steve T. • Johnny and Joey B. • Korey and Andrea • Will and Stephen H. • Michael W. and Qihan • Zach and Nicole • Casey and Ed • Audrey and Zhenmin • Lisette and Taehoon • Erica and Shenheng Phys 150 Lecture 16

2. Announcements • Homework 8 is due on Monday, Oct. 29 at midnight. • Quiz on Chapter 9 on Tuesday, Oct. 30 Phys 150 Lecture 17

3. Light • Reflection • Refraction – bending • Dispersion – frequency-dependent bending Corner reflector Phys 150 Lecture 17

4. i>clicker question Laser When red light passes through a narrow slit, it spreads out. When green light passes through the same slit, it • does not spread out • spreads out the same • spreads out more • spreads out less Phys 150 Lecture 17

5. i>clicker question Laser When red light passes through a narrow slit, it spreads out. When green light passes through the same slit, it • does not spread out • spreads out the same • spreads out more • spreads out less • S/R = L/D where • S = size of wavefront • R = distance from the opening • L = wavelength • D = size of opening L D S R Phys 150 Lecture 17

6. i>clicker question A spy satellite can see more detail if • the lens is large • the lens is thin • it slows down • All of the above Phys 150 Lecture 17

7. i>clicker question A spy satellite can see more detail if • the lens is large • the lens is thin • it slows down • All of the above • S/R = L/D where • S = size of wavefront • R = distance from the opening • L = wavelength • D = size of opening L D S R Phys 150 Lecture 17

8. Interference Diffraction Phys 150 Lecture 17

9. i>clicker question When light passes through many narrow slits, it • produces a fuzzy diffraction pattern • produces a fuzzy interference pattern • produces a sharp diffraction pattern • produces a sharp interference pattern Phys 150 Lecture 17

10. i>clicker question When light passes through many narrow slits, it • produces a fuzzy diffraction pattern • produces a fuzzy interference pattern • produces a sharp diffraction pattern • produces a sharp interference pattern – also a correct answer! Diffraction grating Phys 150 Lecture 17

11. i>clicker question Polaroid sunglasses • have one vertical and one horizontal polarized lens • have lenses that are each horizontally and vertically polarized • have vertically polarized lenses • have horizontally polarized lenses Phys 150 Lecture 17

12. i>clicker question Polarizers Corn syrup Polaroid sunglasses • have one vertical and one horizontal polarized lens • have lenses that are each horizontally and vertically polarized • have vertically polarized lenses • have horizontally polarized lenses Phys 150 Lecture 17

13. i>clicker question An LED television • is a type of plasma TV • is a type of LCD TV • does not contain any LEDs • does not use colored pixels Phys 150 Lecture 17

14. i>clicker question An LED television • is a type of plasma TV • is a type of LCD TV • does not contain any LEDs • does not use colored pixels Phys 150 Lecture 17

15. Light • Reflection • Refraction – bending • Dispersion – frequency-dependent bending • Diffraction – spreading • Interference • Polarization Phys 150 Lecture 17