---
title: "Inverted Image — AP Physics 2 Definition & Exam Guide"
description: "An inverted image is flipped upside down relative to the object and has negative magnification. Learn how mirrors and lenses produce it in AP Physics 2 Unit 13."
canonical: "https://fiveable.me/ap-physics-2-revised/key-terms/inverted-image"
type: "key-term"
subject: "AP Physics 2"
unit: "Unit 13"
---

# Inverted Image — AP Physics 2 Definition & Exam Guide

## Definition

An inverted image is an image flipped upside down relative to the object, indicated by a negative magnification (m < 0). In AP Physics 2, concave mirrors and converging lenses produce inverted images when the object sits outside the focal point, and every inverted image formed this way is real.

## What It Is

An inverted image is exactly what it sounds like. The [image](/ap-physics-2-revised/key-terms/image "fv-autolink") is upside down compared to the object. If the object is an arrow pointing up, the image is an arrow pointing down. In the math of [geometric optics](/ap-physics-2-revised/unit-13/1-reflection/study-guide/Fv9TqORLmcy08pVM "fv-autolink"), inversion shows up as a **negative magnification**. When you compute m = -d_i/d_o (or m = h_i/h_o) and get a negative number, the image is inverted. That's the whole signal.

The deeper idea is *why* inversion happens. When a [concave mirror](/ap-physics-2-revised/key-terms/concave-mirror "fv-autolink") or a converging lens takes light rays leaving one point on the object and bends them back together at a new point, the rays cross. That crossing is what flips the image. This is why inverted images go hand in hand with **real images**: a real image forms when rays actually intersect at a common point (per 13.4.A.3), and that intersection is the flip. Diverging lenses, convex mirrors, and plane mirrors never make the rays cross, so they only produce upright virtual images. A concave mirror or converging lens with the object outside the focal point gives you a real, inverted image every time.

## Why It Matters

Inverted images live in **[Unit 13](/ap-physics-2-revised/unit-13 "fv-autolink"): Geometric Optics**, specifically Topics 13.2 (Images Formed by Mirrors) and 13.4 (Images Formed by Lenses). Learning objectives 13.2.A and 13.4.A both ask you to *describe* the image a mirror or [lens](/ap-physics-2-revised/key-terms/lens "fv-autolink") forms, and 'describe' on this exam means three things: real or virtual, upright or inverted, and enlarged or reduced. You can't answer those questions without knowing what inversion means and what causes it. The orientation of an image is also your fastest sanity check on a calculation. If your mirror equation says the image is real but your magnification comes out positive, something went wrong with your signs. Inverted means negative m, full stop.

## Connections

### [Magnification (Unit 13)](/ap-physics-2-revised/key-terms/magnification)

The sign of the [magnification](/ap-physics-2-revised/key-terms/magnification "fv-autolink") *is* the orientation. Negative m means inverted, positive m means upright. So a magnification of -3 tells you two things at once, the image is three times taller than the object and it's flipped upside down.

### [Concave mirror (Unit 13)](/ap-physics-2-revised/key-terms/concave-mirror)

A concave mirror inverts the image whenever the object is outside the [focal point](/ap-physics-2-revised/key-terms/focal-point "fv-autolink"). Move the object to exactly the center of curvature and you get the special case the exam loves, an inverted image the same size as the object (m = -1).

### [Converging lens (Unit 13)](/ap-physics-2-revised/key-terms/converging-lens)

A [converging lens](/ap-physics-2-revised/key-terms/converging-lens "fv-autolink") does the same trick as a concave mirror but with refraction. Object outside the focal point gives a real, inverted image on the far side of the lens, which is exactly how a projector throws an upside-down-then-corrected picture onto a screen.

### [Ray diagram (Unit 13)](/ap-physics-2-revised/key-terms/ray-diagram)

Ray diagrams let you *see* inversion instead of computing it. Draw the principal rays from the top of the object, and where they cross below the principal axis, that's your inverted image. If they only cross when traced backward, the image is virtual and upright instead.

## On the AP Exam

Inverted images show up constantly in Unit 13 multiple choice, usually through the sign of the magnification. A typical stem gives you two magnifications, say m_A = -3 and m_B = +0.5, and asks what you can conclude about each image. You need to read the negative sign as 'inverted and real' instantly. Another classic asks where an object must sit if a concave mirror produces an inverted image the same size as the object (answer: at the center of curvature, where m = -1). Calculation problems also test it, like finding the magnification of a 2.0 cm object placed 15 cm from a concave mirror with f = 10 cm, then stating what the result means for orientation. On the free-response side, the 2017 Long FRQ had students determine the focal length of a convex lens by projecting an image onto a screen. The unstated physics there is that any image you can catch on a screen is real, and real images from a single lens are inverted. Knowing that connection is what lets you set up the experiment correctly.

## inverted image vs Virtual image

These describe two different properties of an image, and students mash them together. Inverted vs. upright is about *orientation* (is it flipped?). Real vs. virtual is about *how it forms* (do the rays actually intersect, or only appear to?). The reason they get tangled is that for a single mirror or lens they're locked together: real images are inverted and virtual images are upright. But answer the question that's actually asked. If a prompt says 'describe the image,' state orientation AND real/virtual separately, because they're scored as separate claims.

## Key Takeaways

- An inverted image is flipped upside down relative to the object, and it always corresponds to a negative magnification.
- Inversion happens because light rays from the object physically cross when a converging mirror or lens brings them back together, so every inverted image from a single optic is a real image.
- Concave mirrors and converging lenses produce inverted images when the object is placed outside the focal point.
- Plane mirrors, convex mirrors, and diverging lenses never produce inverted images; their images are always virtual and upright.
- An inverted image that is the same size as the object means m = -1, which puts the object exactly at the center of curvature of a concave mirror (or at 2f for a converging lens).
- If an image can be projected onto a screen, it is real, and a real image from a single lens or mirror is inverted.

## FAQs

### What is an inverted image in AP Physics 2?

An inverted image is one that's flipped upside down compared to the object, shown mathematically by a negative magnification. Concave mirrors and converging lenses produce them whenever the object sits outside the focal point.

### Does negative magnification always mean the image is inverted?

Yes. The sign of m carries the orientation, so m = -3 means an inverted image three times the object's height, while m = +0.5 means an upright image half the height. The number tells you size, the sign tells you orientation.

### Are all inverted images real images?

For a single mirror or lens, yes. Inversion happens because the rays physically cross at the image point, and that crossing is the definition of a real image (EK 13.4.A.3). Virtual images from a single optic are always upright.

### What's the difference between an inverted image and a virtual image?

Inverted describes orientation (the image is upside down), while virtual describes formation (the rays only appear to come from the image, they don't actually meet there). They're different properties, even though single-optic real images happen to be inverted and virtual ones upright.

### Can a convex mirror or diverging lens make an inverted image?

No. Convex mirrors and diverging lenses spread rays apart, so the rays never cross and the image is always virtual, upright, and reduced, no matter where you put the object.

## Related Study Guides

- [13.2 Images Formed by Mirrors](/ap-physics-2-revised/unit-13/2-images-formed-by-mirrors/study-guide/INg7VTuspNL1m0MQ)

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