AP Physics 1: Real and Virtual Image Questions

📚 Quick Study Guide

🔍 Real Images: Formed by the actual convergence of light rays. Can be projected onto a screen. Inverted image orientation. 💡 Virtual Images: Formed by the apparent convergence of light rays. Cannot be projected onto a screen. Upright image orientation. 📝 Lens Equation: $\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}$, where $f$ is the focal length, $d_o$ is the object distance, and $d_i$ is the image distance. 📐 Magnification Equation: $M = -\frac{d_i}{d_o} = \frac{h_i}{h_o}$, where $h_i$ is the image height and $h_o$ is the object height. A negative magnification indicates an inverted image. 🔭 Converging Lens (Convex): Can form both real and virtual images depending on the object's distance from the lens. ✨ Diverging Lens (Concave): Always forms virtual, upright, and reduced images.

Practice Quiz

1. A converging lens has a focal length of 10 cm. An object is placed 15 cm from the lens. Which of the following describes the image formed?
   1. Real, inverted, and magnified
   2. Real, upright, and magnified
   3. Virtual, inverted, and reduced
   4. Virtual, upright, and magnified
2. An object is placed 5 cm from a diverging lens with a focal length of -10 cm. What type of image is formed?
   1. Real and inverted
   2. Real and upright
   3. Virtual and inverted
   4. Virtual and upright
3. If the magnification of an image is -2, what does this indicate about the image?
   1. The image is real and twice the size of the object.
   2. The image is virtual and twice the size of the object.
   3. The image is real and half the size of the object.
   4. The image is virtual and half the size of the object.
4. A real image is formed 20 cm from a lens when the object is placed 10 cm away. What is the focal length of the lens?
   1. 5.0 cm
   2. 6.7 cm
   3. 10.0 cm
   4. 20.0 cm
5. Which type of lens can only form virtual images?
   1. Converging lens
   2. Diverging lens
   3. Both converging and diverging lenses
   4. Neither converging nor diverging lenses
6. An object is placed at the focal point of a converging lens. Where is the image formed?
   1. At the focal point
   2. At twice the focal length
   3. At infinity
   4. No image is formed
7. What is the sign convention for the image distance ($d_i$) when a virtual image is formed?
   1. Positive
   2. Negative
   3. Zero
   4. Undefined