Physics
Lesson 14-3: Concave Mirrors Part 2
Example 1: When an object is placed 30.0 cm in front of a concave mirror, a real image is formed
60.0 cm from the mirror’s surface. Find the focal length.
Example 2: A square object is placed 15 cm in front of a concave mirror with a focal length of 25
cm. A round object is placed 45 cm in front of the same mirror. Find the image distance,
magnification, and type of image formed for each object. Draw ray diagrams for each object to
confirm your answers.
Example 3: Suppose you place a 5.0 cm tall spring in front of a concave mirror. The mirror has a
focal length of 24 cm. The spring forms an image that appears to be at the same position as the
spring, but the image is inverted. Where did you place the spring? How tall is the spring’s image?
Homework: Complete the Problem 14B worksheet