Ch 18 Review
Mirrors
1. Draw a ray diagram to locate images of the following objects. Describe the
image as either real or virtual; upright or inverted; and enlarged, reduced, or
same size.
a.
b.
c.
2. A 5.00 cm high object is placed 20.0 cm in front of a concave mirror with a
radius of 30.0 cm.
- Where is the image located?
- What is the magnification?
- How tall is the image?
3. A 1.40 m high Great Dane stands 2.20 m in front of a convex gazing ball in his
backyard. The gazing ball has radius of curvature of 50.0 cm.
- Where is the image of the Great Dane located?
- How tall is the image?
4. A hospital has a convex mirror at the end of a hallway. When a person is 6.00 m from the mirror, their image is ⅔ as tall as they are. What is the focal length of this mirror?
Lenses
5. Draw ray diagrams to locate the images of the following objects. Tell whether
each image is real or virtual; upright or inverted; and enlarged, reduced, or
same size.
a.
b.
c.
6. An object is placed 10.0 cm in front of a convex lens with a focal length of
15.0 cm. Where is the image located?
7. An object is placed 13.0 cm in front of a concave lens. A virtual image is 8.00
cm in front of the lens. What is the focal length of the lens?
8. A lens with an object 40.0 cm from it produces an image that is upright and ¼ as
large. What is the focal length of the lens? What type of lens is it? Explain how you know?
1. See teacher key
2. a) 60.0 cm, b) -3.00, c) -15.0 cm
3. a) -0.224 m, b) 0.143 m
4. -12.0 m
5. See teacher key
6. -30.0 cm
7. -20.8 cm
8. -13.3 cm; concave lens; negative focal length