--- title: "Unit 13 – Geometric Optics - AP Physics 2" description: "Review Unit 13 – Geometric Optics for AP Physics 2 with Fiveable study guides and practice resources." canonical: "https://fiveable.me/ap-physics-2-revised/unit-13" type: "unit" subject: "AP Physics 2" unit: "Unit 13 – Geometric Optics" --- # Unit 13 – Geometric Optics - AP Physics 2 ## Overview Unit 13 – Geometric Optics ## Study Guides - [13.1 Reflection](/ap-physics-2-revised/unit-13/1-reflection/study-guide/Fv9TqORLmcy08pVM) - [13.2 Images Formed by Mirrors](/ap-physics-2-revised/unit-13/2-images-formed-by-mirrors/study-guide/INg7VTuspNL1m0MQ) - [13.3 Refraction](/ap-physics-2-revised/unit-13/3-refraction/study-guide/YzOrOgRzNywGkdfS) - [13.4 Images Formed by Lenses](/ap-physics-2-revised/unit-13/4-images-formed-by-lenses/study-guide/jCmOQUUyw4iza3To) ## FAQs ### What topics are covered in AP Physics 2 Unit 13? AP Physics 2 Unit 13 covers 4 topics in geometric optics: **13.1 Reflection**, **13.2 Images Formed by Mirrors**, **13.3 Refraction**, and **13.4 Images Formed by Lenses**. You'll use the ray model of light to trace how light bounces off mirrors and bends through lenses to form real and virtual images. See all four topics at [/ap-physics-2-revised/unit-13](/ap-physics-2-revised/unit-13). ### How much of the AP Physics 2 exam is Unit 13? AP Physics 2 Unit 13 makes up 12-15% of the AP exam, making geometric optics one of the heavier-weighted units. That weight comes from four topics: reflection, images formed by mirrors, refraction, and images formed by lenses. Expect both multiple-choice and free-response questions that test your ability to draw ray diagrams and apply the mirror and lens equations. ### What's on the AP Physics 2 Unit 13 progress check (MCQ and FRQ)? The AP Physics 2 Unit 13 progress check in AP Classroom includes both MCQ and FRQ parts drawn from all four unit topics: reflection, images formed by mirrors, refraction, and images formed by lenses. MCQ questions typically ask you to identify image properties or predict how changing a lens affects image location. FRQ parts ask you to draw ray diagrams, apply the thin-lens or mirror equation, and explain your reasoning. For matched practice before the progress check, visit [/ap-physics-2-revised/unit-13](/ap-physics-2-revised/unit-13). ### How do I practice AP Physics 2 Unit 13 FRQs? AP Physics 2 Unit 13 FRQs most often come from Images Formed by Mirrors and Images Formed by Lenses, so those two topics deserve the most FRQ practice. Question types include drawing ray diagrams for concave and convex mirrors or converging and diverging lenses, solving for image distance and magnification using the mirror or thin-lens equation, and explaining why an image is real or virtual. To practice, work through problems where you change object distance and predict how the image shifts, then write out your reasoning in full sentences the way the scoring guidelines expect. Find practice problems and study guides at [/ap-physics-2-revised/unit-13](/ap-physics-2-revised/unit-13). ### Where can I find AP Physics 2 Unit 13 practice questions? The best place to find AP Physics 2 Unit 13 practice questions, including multiple-choice and practice test sets, is [/ap-physics-2-revised/unit-13](/ap-physics-2-revised/unit-13). That page has resources covering all four topics: reflection, images formed by mirrors, refraction, and images formed by lenses. For MCQ practice, focus on questions that ask you to compare image types across different mirror and lens setups, since those are the most common question formats on the actual exam. ### How should I study AP Physics 2 Unit 13? Start with reflection and the ray model before moving to mirrors and lenses, since each topic builds on the last. For each topic, sketch ray diagrams by hand until locating images feels automatic, then practice the mirror equation and thin-lens equation with numbers. A solid study plan looks like this: 1. **Reflection (13.1):** Review the law of reflection and practice tracing rays off flat and curved surfaces. 2. **Images Formed by Mirrors (13.2):** Draw ray diagrams for concave and convex mirrors, then solve mirror equation problems for real and virtual images. 3. **Refraction (13.3):** Work through Snell's law problems and understand total internal reflection. 4. **Images Formed by Lenses (13.4):** Repeat the ray diagram process for converging and diverging lenses, connecting results to the thin-lens equation. After each topic, do a short set of practice questions to catch gaps early. Since geometric optics is 12-15% of the AP exam, it's worth spending real time here. All study materials are at [/ap-physics-2-revised/unit-13](/ap-physics-2-revised/unit-13). ## Structured Data ```json {"@context":"https://schema.org","@type":"FAQPage","inLanguage":"en","mainEntity":[{"@type":"Question","@id":"https://fiveable.me/ap-physics-2-revised/unit-13#what-topics-are-covered-in-ap-physics-2-unit-13","name":"What topics are covered in AP Physics 2 Unit 13?","acceptedAnswer":{"@type":"Answer","text":"AP Physics 2 Unit 13 covers 4 topics in geometric optics: **13.1 Reflection**, **13.2 Images Formed by Mirrors**, **13.3 Refraction**, and **13.4 Images Formed by Lenses**. You'll use the ray model of light to trace how light bounces off mirrors and bends through lenses to form real and virtual images. See all four topics at /ap-physics-2-revised/unit-13."}},{"@type":"Question","@id":"https://fiveable.me/ap-physics-2-revised/unit-13#how-much-of-the-ap-physics-2-exam-is-unit-13","name":"How much of the AP Physics 2 exam is Unit 13?","acceptedAnswer":{"@type":"Answer","text":"AP Physics 2 Unit 13 makes up 12-15% of the AP exam, making geometric optics one of the heavier-weighted units. That weight comes from four topics: reflection, images formed by mirrors, refraction, and images formed by lenses. Expect both multiple-choice and free-response questions that test your ability to draw ray diagrams and apply the mirror and lens equations."}},{"@type":"Question","@id":"https://fiveable.me/ap-physics-2-revised/unit-13#whats-on-the-ap-physics-2-unit-13-progress-check-mcq-and-frq","name":"What's on the AP Physics 2 Unit 13 progress check (MCQ and FRQ)?","acceptedAnswer":{"@type":"Answer","text":"The AP Physics 2 Unit 13 progress check in AP Classroom includes both MCQ and FRQ parts drawn from all four unit topics: reflection, images formed by mirrors, refraction, and images formed by lenses. MCQ questions typically ask you to identify image properties or predict how changing a lens affects image location. FRQ parts ask you to draw ray diagrams, apply the thin-lens or mirror equation, and explain your reasoning. For matched practice before the progress check, visit /ap-physics-2-revised/unit-13."}},{"@type":"Question","@id":"https://fiveable.me/ap-physics-2-revised/unit-13#how-do-i-practice-ap-physics-2-unit-13-frqs","name":"How do I practice AP Physics 2 Unit 13 FRQs?","acceptedAnswer":{"@type":"Answer","text":"AP Physics 2 Unit 13 FRQs most often come from Images Formed by Mirrors and Images Formed by Lenses, so those two topics deserve the most FRQ practice. Question types include drawing ray diagrams for concave and convex mirrors or converging and diverging lenses, solving for image distance and magnification using the mirror or thin-lens equation, and explaining why an image is real or virtual. To practice, work through problems where you change object distance and predict how the image shifts, then write out your reasoning in full sentences the way the scoring guidelines expect. Find practice problems and study guides at /ap-physics-2-revised/unit-13."}},{"@type":"Question","@id":"https://fiveable.me/ap-physics-2-revised/unit-13#where-can-i-find-ap-physics-2-unit-13-practice-questions","name":"Where can I find AP Physics 2 Unit 13 practice questions?","acceptedAnswer":{"@type":"Answer","text":"The best place to find AP Physics 2 Unit 13 practice questions, including multiple-choice and practice test sets, is /ap-physics-2-revised/unit-13. That page has resources covering all four topics: reflection, images formed by mirrors, refraction, and images formed by lenses. For MCQ practice, focus on questions that ask you to compare image types across different mirror and lens setups, since those are the most common question formats on the actual exam."}},{"@type":"Question","@id":"https://fiveable.me/ap-physics-2-revised/unit-13#how-should-i-study-ap-physics-2-unit-13","name":"How should I study AP Physics 2 Unit 13?","acceptedAnswer":{"@type":"Answer","text":"Start with reflection and the ray model before moving to mirrors and lenses, since each topic builds on the last. For each topic, sketch ray diagrams by hand until locating images feels automatic, then practice the mirror equation and thin-lens equation with numbers. A solid study plan looks like this: 1. **Reflection (13.1):** Review the law of reflection and practice tracing rays off flat and curved surfaces.\n2. **Images Formed by Mirrors (13.2):** Draw ray diagrams for concave and convex mirrors, then solve mirror equation problems for real and virtual images.\n3. **Refraction (13.3):** Work through Snell's law problems and understand total internal reflection.\n4. **Images Formed by Lenses (13.4):** Repeat the ray diagram process for converging and diverging lenses, connecting results to the thin-lens equation. After each topic, do a short set of practice questions to catch gaps early. Since geometric optics is 12-15% of the AP exam, it's worth spending real time here. All study materials are at /ap-physics-2-revised/unit-13."}}]} ```