multi slits

Introduction to Thin Films

• Context: Discussion on SoundCloud mixes which metaphorically leads to discussing thin films in light physics.

Lab and Practice Test Information

• Logistics:
  • Next Wednesday's lab is a problem session to prepare for the upcoming test.
  • The lab will be open from 12:30 PM, and students are encouraged to attend at their convenience.
  • A practice test will be provided to allow ample preparation, similar to test one.
  • Stated that solutions will not be given but assistance can be sought during practice.
  • Other assessments: Ln K6 modified to allow students more time, due by Friday.
  • Test 1 Kappa 7 due date is fixed, must be completed before the end of the month.

Thin Films Concept

• Key Idea: Thin films create unique interference patterns due to the reflection and refraction of light.
  • Path Difference: The formula indicates that the path difference between rays reflects the thickness of the film:
  • $ext{Path difference} = 2 imes ext{thickness}$
  • This path difference must equal some fraction of the wavelength inside the film.
  • Wavelength Notation:
  • Wavelength outside the film: $ext{λ}_{ ext{air}}$
  • Wavelength inside the film: $ext{λ}<em>{ ext{inside}} = \frac{ ext{λ}</em>{ ext{air}}}{n}$ where $n$ is the index of refraction.