College Board-Aligned Original Notes

AP Physics 2: Algebra-Based Unit 13 Topic 2: Images from lenses and mirrors

Lenses and mirrors form images by redirecting light rays according to reflection or refraction.

Unit 13: Geometric Optics. College Board exam weighting listed for this unit: 12%-15% of exam score.

What to Know

Ray diagrams locate images using predictable rays through focal points or centers of curvature.
Image properties include real or virtual, upright or inverted, and enlarged or reduced.
Sign conventions matter when using mirror and lens equations.
Always connect this topic back to the larger unit: Geometric Optics.

Detailed Notes

Images from lenses and mirrors belongs to Unit 13: Geometric Optics. Lenses and mirrors form images by redirecting light rays according to reflection or refraction. Start by identifying the system, the field or interaction involved, and which conservation law or model applies.

Key relationships: Ray diagrams locate images using predictable rays through focal points or centers of curvature. Image properties include real or virtual, upright or inverted, and enlarged or reduced. Sign conventions matter when using mirror and lens equations.

Model to use: Draw principal rays for a converging lens or mirror and locate where rays meet or appear to meet. A clear AP Physics 2 model should label directions, signs, units, and the physical meaning of each variable.

AP-style move: After calculating an image distance, interpret the sign and describe the physical image properties. For free-response work, show the governing principle first, then connect the mathematical result back to the physical situation.

Key Vocabulary

Focal point

Point where parallel rays converge or appear to diverge after reflection or refraction.

Real image

An image formed where light rays actually meet.

Virtual image

An image formed where light rays appear to originate.

Magnification

The ratio of image height to object height.

Principal ray

A ray with a predictable path used in image diagrams.

Quick Practice

How would you explain Images from lenses and mirrors in one or two AP-style sentences?

Name the concept, apply it to a specific example or source, and explain the reasoning that connects the evidence to your answer.

Official Alignment

Reference and Attribution

AP Physics 2 concept reference: AP Physics 2: Concise Summary Notes by IITian Academy. EduCompanion used this source as a topic checklist and conceptual reference, then rewrote the study notes in original wording.

AP Physics 2: Concise Summary Notes