Physics 2 · Covers properties of light, geometric optics, image formation, and physical optics interference effects · 5 min read · Updated 2026-05-11
Geometric and Physical Optics Overview — AP Physics 2
AP Physics 2 · Covers properties of light, geometric optics, image formation, and physical optics interference effects · 5 min read
1. Unit at a Glance
We progress through this unit from the fundamental nature of light to applied optical phenomena, building your understanding of both core models of light. We start with foundational properties of electromagnetic waves and core wave behavior, then move to geometric optics where the ray model explains reflection, refraction, and image formation. Finally, we return to the wave model to explore physical optics effects that can only be explained by light's wave nature, like interference and diffraction.
Common Pitfalls
Why: Sign errors for focal length or image distance lead to wrong predictions for image position and size.
Why: The ray model assumes light travels in straight lines and cannot account for wave-specific interaction effects.
Why: Half-wavelength phase shifts upon reflection change the path difference required for constructive vs destructive interference.