Physics 2142

11. If a virtual image is formed 10.0 cm along the principal axis from a convex mirror of focal length -15.0 cm, how far is the object from the mirror? a. 30.0 cm b. 10.0 cm c. 6.00 cm d. 3.00 cm

A

15. Which of the following best describes the image of a concave mirror when the object's distance from the mirror is less than the focal point distance? a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one

A

18. A convex mirror with a focal length of 20 cm forms an image 15 cm behind the surface. If the object height is 1.2 cm what is the image height? a. 0.30 cm b. 0.75 cm c. 0.94 cm d. 3.0 cm

A

20. An object is held at a distance of 12 cm from a convex mirror creating an image that is 1/3 the object size. What is the focal length of the mirror? a. 6.0 cm b. 3.0 cm c. 9.0 cm d. 18 cm

A

24. A girl is standing in front of a concave mirror. Consider two rays of light, one from her nose and one from her mouth that are parallel as they are traveling toward the mirror. These rays will come together: a. at the focal point. b. at the center of curvature. c. at the image point. d. behind the mirror if she is too close to the mirror.

A

25. A candle is 49.0 cm in front of a convex spherical mirror of radius of curvature 70.0 cm. What are the image distance and the magnification, respectively? a. 20.4 cm, +0.417 b. +20.4 cm, 0.417 c. +122.5 cm, +2.50 d. 20.4 cm, 0.417

A

31. A solid glass sphere with a radius of 5.00 cm and index of refraction of 1.52 has a small coin embedded 3.00 cm from the front surface of the sphere. For the viewer looking at the coin through the glass, at what distance from the front surface of the glass does the coin's image appear to be located? a. 2.48 cm b. 3.20 cm c. 5.00 cm d. 6.85 cm

A

35. A container is filled with fluid 1, and the apparent depth of the fluid is 5.00 cm. The container is next filled with fluid 2, and the apparent depth of this fluid is 4.00 cm. If the index of refraction of the first fluid is 1.60, what is the index of refraction of the second fluid? a. 2.00 b. 1.79 c. 1.28 d. More information is needed to find the value.

A

36. An object of length 3.00 cm is inside a plastic block with index of refraction 1.40. If the object is viewed from directly above, what is the length of its image? a. 3.00 cm b. 4.20 cm c. 2.13 cm d. 0.467 cm

A

14. Which of the following best describes the image of a concave mirror when the object is at a distance greater than twice the focal point distance from the mirror? a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one

B

19. An object placed 12 cm from a concave mirror produces a real image 8.0 cm from the mirror. If the object is now moved to a new position 18.0 cm from the mirror, where is the new image located as measured from the mirror? a. 3.0 cm b. 6.5 cm c. 9.2 cm d. 14.6 cm

B

22. When the reflection 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 enlarged.

B

23. Parallel rays of light that hit a concave mirror will come together: a. at the center of curvature. b. at the focal point. c. at a point half way to the focal point. d. at infinity.

B

26. An object 2 cm high is placed 10 cm in front of a mirror. What type of mirror and what radius of curvature is needed for an image that is upright and 4 cm tall? a. Concave, R = 20 cm b. Concave, R = 40 cm c. Convex, R = 10 cm d. Convex, R = 20 cm

B

32. A glass block, for which n = 1.52, has a blemish located 3.2 cm from one surface. At what distance from that surface does the image of the blemish appear to the outside observer? a. 1.6 cm b. 2.1 cm c. 4.9 cm d. 6.4 cm

B

34. A container is filled with fluid 1 and the apparent depth of the fluid is 5 cm. The container is next filled with fluid 2, and the apparent depth of this fluid is 4 cm. What is the ratio of the indices of refraction of these fluids? a. n1/n2 = 5/4 b. n1/n2 = 4/5 c. n1/n2 = d. More information is needed to find the ratio.

B

38. Atmospheric refraction of light rays is responsible for: a. spherical aberration. b. mirages. c. chromatic aberration. d. light scattering.

B

4. When the reflection of an object is seen in a plane mirror, the distance from the mirror to the image depends on: a. the wavelength of light used for viewing. b. the distance from the object to the mirror. c. the distance of both the observer and the object to the mirror. d. the size of the object.

B

40. A 3.0 cm tall object is placed along the principal axis of a thin convex lens of 30.0 cm focal length. If the object distance is 40.0 cm, which of the following best describes the image distance and height, respectively? a. 17.3 cm and 7.0 cm b. 120 cm and 9.0 cm c. 17.3 cm and 1.3 cm d. 120 cm and 1.0 cm

B

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: a. is equal to the height of the man. b. is equal to one half the height of the man. c. depends on the distance the man stands from the mirror. d. depends on both the height of the man and the distance from the man to the mirror.

B

1.You stand two feet away from a plane mirror. How far is it from you to your image?a. 2.0 ftb. 3.0 ftc. 4.0 ftd. 5.0 ft

C

16. Which of the following best describes the image of a convex mirror when the object's distance from the mirror is less than the absolute value of the focal point distance? a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one

C

2. Which of the following best describes the image from a plane mirror? a. virtual and magnification greater than one b. real and magnification less than one c. virtual and magnification equal to one d. real and magnification equal to one

C

21. When the reflection of an object is seen in a concave mirror the image will: a. always be real. b. always be virtual. c. may be either real or virtual. d. will always be enlarged.

C

27. An object is 12.0 cm from the surface of a spherical Christmas tree ornament that is 8.00 cm in diameter. What is the magnification of the image? a. 0.200 b. 0.500 c. +0.143 d. +0.250

C

3. When the reflection 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.

C

30. Ron fills a beaker with glycerin (n = 1.473) to a depth of 5.0 cm. If he looks straight down through the glycerin surface, he will perceive the liquid to be what apparent depth? a. 7.4 cm b. 5.0 cm c. 3.4 cm d. 1.0 cm

C

37. An object of length 3.00 cm is inside a plastic block with index of refraction 1.40. If the object is viewed through the top surface of the block at a non-zero angle from the normal, where is the object relative to its image? a. in the same direction as its image b. above the direction of its image c. below the direction of its image d. More information is needed.

C

39. If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed? a. Both would be later. b. Both would be earlier. c. Sunrise would be later and sunset earlier. d. Sunrise would be earlier and sunset later.

C

7. How large should a wall-mounted mirror be to view the upper half of one's height, h? a. h b. h/2 c. h/4 d. The answer is not given.

C

10. 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 cm b. 10 cm c. 12 cm d. 6.0 cm

D

12. A woman looking in a makeup mirror sees her face at twice its actual size and right-side up. If she is 28.0 cm from the mirror, what is its focal length? a. 18.6 cm b. 44.0 cm c. 48.3 cm d. 56.0 cm

D

13. Which best describes the image of a concave mirror when the object is located somewhere between the focal point and twice the focal point distance from the mirror? a. virtual, upright and magnification greater than one b. real, inverted and magnification less than one c. virtual, upright and magnification less than one d. real, inverted and magnification greater than one

D

17. A convex mirror with focal length of 20 cm forms an image 12 cm behind the surface. Where is the object located as measured from the surface? a. 7.5 cm b. 15 cm c. 22 cm d. 30 cm

D

28. An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 2. Which of the following statements is true? a. The focal length of the mirror is 30 cm. b. The image is real. c. There is not enough information to select the correct answer. d. This is the only true statement.

D

29. An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 2. Which of the following statements is false? a. The focal length of the mirror is 20 cm. b. The image is virtual. c. There is enough information to select the correct answer. d. This is the only true statement.

D

33. A goldfish is swimming in water (n = 1.33) inside a spherical plastic bowl of index of refraction 1.33. If the goldfish is 10 cm from the front wall of the 15-cm radius bowl, where does the goldfish appear to an observer in front of the bowl? a. 6.0 cm behind the plastic b. 7.0 cm behind the plastic c. 8.0 cm behind the plastic d. 9.0 cm behind the plastic

D

8. The real image of an object is located 45.0 cm away from a concave mirror, which has a focal length of 10.0 cm. How far is the object from the mirror? a. 40.0 cm b. 35.0 cm c. 22.5 cm d. 12.9 cm

D

9. A concave mirror forms a real image at 25.0 cm from the mirror surface along the principal axis. If the corresponding object is at a 10.0-cm distance, what is the mirror's focal length? a. 1.43 cm b. 16.7 cm c. 12.4 cm d. 7.14 cm

D

The lateral magnification for a flat mirror: a. is a function of the object distance. b. is a function of the image distance. c. is a function of the object and image distance. d. is 1.

D