# Unit 13 Review

1. As the angle of incidence is increased for a ray incident on a reflecting surface, the angle between the incident and reflected rays ultimately approaches what value?

 a. zero b. 45 degrees c. 90 degrees d. 180 degrees

The Law of Reflection (7 seconds)

2. If you stand three feet in front of a plane mirror, how far away would you see yourself in the mirror?

 a. 1.5 ft b. 3.0 ft c. 6.0 ft d. 12.0 ft

Image Characteristics for Plane Mirrors (6 seconds)

3. A concave mirror with a focal length of 10 cm creates a real image 30 cm away on its principal axis; the corresponding object is located how far from the mirror?
 a. 20.0 cm b. 15.0 cm c. 7.5 cm d. d. 5.0 cm

The Mirror Equation - Concave Mirrors (6 seconds)

4. A concave mirror forms a real image at 25 cm from the mirror surface along the principal axis. If the corresponding object is at a 10 cm distance, what is the mirror's focal length?

 a. 1.4 cm b. 16.7 cm c. 12.4 cm d. 7.1 cm

The Mirror Equation - Concave Mirrors (6 seconds) | Image Characteristics for Concave Mirrors (9 seconds)

5. If a virtual image is formed along the principal axis 10 cm from a concave mirror with the focal length 15 cm, what is the object distance from the mirror?

 a. 30.0 cm b. 10.0 cm c. 12.4 cm d. 6.0 cm

The Mirror Equation - Concave Mirrors (6 seconds) | Image Characteristics for Concave Mirrors (9 seconds)

6. If a virtual image is formed 10 cm along the principal axis from a convex mirror of focal length -15 cm, what is the object distance from the mirror?

 a. 30.0 cm b. 10.0 cm c. 6.0 cm d. 3.0 cm

Image Characteristics for Convex Mirrors (7 seconds) | The Mirror Equation - Convex Mirrors (5 seconds)

7. If a man's face is 30 cm in front of a concave shaving mirror creating an upright image 1.5 times as large as the object, what is the mirror's focal length?

 a. 12.0 cm b. 20.0 cm c. 70.0 cm d. 90.0 cm

The Mirror Equation - Concave Mirrors (6 seconds) | Image Characteristics for Concave Mirrors (9 seconds)

8. Which of the following best describes the image of a plane mirror?

1. virtual, inverted and enlarged
2. real, inverted and reduced
3. virtual, upright and the same size as object
4. real, upright and the same size as object

Image Characteristics for Plane Mirrors (6 seconds)

9. Which of the following best describes the image of a concave mirror when the object is located somewhere between the focal point (F) and the center of curvature (C) of the mirror?

 a. virtual, upright and enlarged b. real, inverted and reduced c. virtual, upright and reduced d. real, inverted and enlarged

The Anatomy of a Curved Mirror (6 seconds)

10. Which of the following best describes the image of a concave mirror when the object is at a distance further than the center of curvature (C) of the mirror?

 a. virtual, erect and enlarged b. real, inverted and reduced c. virtual, upright and reduced d. real, inverted and enlarged

Ray Diagrams - Concave Mirrors (14 seconds) | Image Characteristics for Concave Mirrors (9 seconds)

11. Which of the following best describes the image of a concave mirror when the object distance from the mirror is less than the focal point (F) distance?

 a. virtual, upright and enlarged b. real, inverted and reduced c. virtual, upright and reduced

Ray Diagrams - Concave Mirrors (14 seconds) | Image Characteristics for Concave Mirrors (9 seconds)

12. Which of the following best describes the image of a convex mirror when the object distance from the mirror is less than the absolute value of the focal point (F) distance?

 a. virtual, upright and enlarged b. real, inverted and reduced c. virtual, upright and reduced d. real, inverted and enlarged

Ray Diagrams - Convex Mirrors (8 seconds) | Image Characteristics for Convex Mirrors (7 seconds)

13. Use of a parabolic mirror, instead of one made of a circular arc surface, can be used to reduce the occurrence of which of the following effects?

 a. spherical aberration b. mirages c. chromatic aberration d. light scattering

Spherical Aberration (6 seconds)

14. When the image of an object is seen in a plane mirror, the image is

 a. real and upright. b. real and inverted. c. virtual and upright. d. virtual and inverted.

Image Characteristics for Plane Mirrors (6 seconds)

15. When the image of an object is seen in a plane mirror, the distance from the mirror to the image depends on

1. the wavelength of light used for viewing.
2. the distance from the object to the mirror.
3. the distance of both the observer and the object to the mirror.

Image Characteristics for Plane Mirrors (6 seconds) | Ray Diagrams for Plane Mirrors (11 seconds)

16. If a man wishes to use a plane mirror on a wall to view both his head and his feet as he stands in front of the mirror, the required length of the mirror

1. is equal to the height of the man.
2. is equal to one half the height of the man.
3. depends on the distance the man stands from the mirror.
4. depends on both the height of the man and the distance from the man to the mirror.

What Portion of a Mirror is Required to View an Image? (7 seconds)

17. When the image of an object is seen in a concave mirror the image will

 a. always be real. b. always be virtual. c. be either real or virtual. d. will always be magnified.

Image Characteristics for Concave Mirrors (9 seconds)

18. When the image of an object is seen in a convex mirror the image will

 a. always be real. b. always be virtual. c. may be either real or virtual. d. will always be magnified.

Image Characteristics for Convex Mirrors (7 seconds)

19. Rays of light traveling parallel to the principal axis of a concave mirror will come together

 a. at the center of curvature. b. at the focal point. c. at infinity. d. at a point half way to the focal point.

Reflection of Light and Image Formation (6 seconds)

20. Distinguish between diffuse and regular (specular) reflection in terms of both cause and result.

Specular vs. Diffuse Reflection (22 seconds)

 21. Consider the following object in front of a plane mirror. Construct a ray diagram to show how light tavels from the object (arrow) to the mirror and ultimately to the eye; then indicate the portion of the mirror needed in order for the eye to view the image.

Ray Diagrams for Plane Mirrors (11 seconds)

22. Construct ray diagrams to show where the images of the following objects are located. Dray in the complete image and describe its characteristics (real or virtual, enlarged or reduced in size, inverted or upright). (NOTE: review the ray diagrams for all possible objects locations for each device.)

Ray Diagrams - Concave Mirrors (14 seconds) | Ray Diagrams - Convex Mirrors (8 seconds)