PHYS 1120 · Exam 3 · Optics

Physics Study Guides

Complete optics coverage: geometric optics, wave optics, refraction, mirrors, lenses, interference, and diffraction. Every exam question solved with all variations and what-if scenarios.

Snell's Lawn₁ sinθ₁ = n₂ sinθ₂ · Mirror/Lens1/xₒ + 1/xᵢ = 1/f · Single Slit Darksinθ = mλ/a · Thin Film2t = (m+½)λ/n

Chapter tutorials

CH 23 / LIGHT & REFRACTION

Light, Refraction & Optical Properties

Speed of light in media, index of refraction, Snell's Law, total internal reflection, wavelength & frequency changes, dispersion, and Brewster's angle. 18 slides with SVG diagrams.

TUTORIAL · 18 SLIDES

CH 24 / GEOMETRIC OPTICS

Mirrors & Lenses — Ray Diagrams

Concave & convex mirrors, converging & diverging lenses, mirror/lens equations, magnification, 3-ray method, real vs. virtual images. All object-distance cases mapped. 18 slides.

TUTORIAL · 18 SLIDES

CH 26 / WAVE OPTICS

Interference, Diffraction & Thin Films

Two-source interference, double-slit bright/dark fringes, single-slit diffraction, thin-film interference with phase shifts, effect of medium on fringe spacing. 18 slides.

TUTORIAL · 18 SLIDES

Exam 3 solutions

EXAM 3 / FULL SOLUTIONS

Exam 3 — All Questions, All Variations & What-If Scenarios

Every exam question solved step-by-step with words, diagrams, and equations. Each problem includes all variations: what if the medium changes, the object distance changes, the wavelength changes, or the geometry flips. Primary study guide for the exam.

11 PROBLEMS · ALL VARIATIONS

Quick reference decks

REF / FORMULA SHEET

All Optics Formulas, Sign Conventions & Constants

One-page formula reference: Snell's Law, mirror equation, thin lens equation, single/double slit, thin film conditions, index values for common media, speed of light relationships.

CHEAT SHEET