There's this thin film on my teeth...(Eww)

Hi everyone,

Here is the link to the physics lesson website - be sure to check out the lesson on thin film interference, as well as on diffraction.

Please also be aware that there will be construction Saturday on the 6 line downtown on the way to the REACH workshop at Baruch College. Please give yourself plenty of time to get there by 8:00 AM.

From handout:

4. thickness = 1.05 x 10^-7 m

5. thickness = 96.1 nanometers

1984B5
a) 5 x 10¹⁴ Hz
b) 4.8 x 10^-7 m
c) 1.2 x 10^-7 m
d) 2.4 x 10^-7 m

2000B5.

I apologize for not getting this solutions up quickly, but you must be aware that part (a) of this question is worth 8 of the 15 points. You need to make sure you draw BOTH angles of reflection, BOTH angles of refraction (after using Snell's Law), and include the angle of incidence (35 degrees) of the light ray upon hitting the bottom surface of the glass.

Parts b and c are, by comparison, relatively tame. I will post this ASAP.


38. wavelength = 643 nm, which is colored red.
40. 169 nm
43. 27*lambda/n = 2t, so t = 9045 nanometers, or 9.045 x 10^-6 m
45. 2t = n*(640 nm/1.36), and 2t = (n + 1/2)*512 nm/1.36. Solving the system, t = 471 nanometers.