Optics

1. Optics

2. What is the radius of curvature of a plane mirror? • zero • infinity • it is equal to the length of the mirror

3. What is the radius of curvature of a plane mirror? • zero • infinity • it is equal to the length of the mirror

4. The technical name for the type of image formed by a single plane mirror is • a real image. • an inverted image. • an enlarged image. • a focal image. • a virtual image.

5. The technical name for the type of image formed by a single plane mirror is • a real image. • an inverted image. • an enlarged image. • a focal image. • a virtual image.

6. When an object is closer to a concave mirror than the mirror's focal point, the • magnification is less than one. • image distance is greater than the object distance. • image distance is negative. • image is inverted. • All of these are correct.

7. When an object is closer to a concave mirror than the mirror's focal point, the • magnification is less than one. • image distance is greater than the object distance. • image distance is negative. • image is inverted. • All of these are correct.

8. When an object is farther from a convex mirror than the mirror's focal length, the • magnification is less than one. • image distance is greater than the object distance. • image is real. • image is inverted. • All of these are correct.

9. When an object is farther from a convex mirror than the mirror's focal length, the • magnification is less than one. • image distance is greater than the object distance. • image is real. • image is inverted. • All of these are correct.

10. When an object is farther from a concave mirror than twice the mirror's focal length, the • magnification is less than one. • image is inverted. • image distance is less than the object distance. • image is real. • All of these are correct.

11. When an object is farther from a concave mirror than twice the mirror's focal length, the • magnification is less than one. • image is inverted. • image distance is less than the object distance. • image is real. • All of these are correct.

12. The image of an object located 10 cm from a concave spherical mirror of radius 10 cm is • real, inverted, and magnified. • real, inverted, and diminished. • real, inverted, and the same size. • virtual, upright, and magnified. • virtual, upright, and diminished.

13. The image of an object located 10 cm from a concave spherical mirror of radius 10 cm is • real, inverted, and magnified. • real, inverted, and diminished. • real, inverted, and the same size. • virtual, upright, and magnified. • virtual, upright, and diminished.

14. The image of an object, placed in front of a spherical convex mirror as shown, forms between • O and V and is magnified. • V and F and is magnified. • V and F and is diminished. • F and C and is diminished. • F and C and is magnified.

15. The image of an object, placed in front of a spherical convex mirror as shown, forms between • O and V and is magnified. • V and F and is magnified. • V and F and is diminished. • F and C and is diminished. • F and C and is magnified.

16. An object is located 3 cm from the surface of a silvered spherical glass Christmas tree ornament that is 3 cm in diameter. The image forms at which labeled point?

17. An object is located 3 cm from the surface of a silvered spherical glass Christmas tree ornament that is 3 cm in diameter. The image forms at which labeled point?

18. An object is placed between 2f and infinity in front of a concave mirror of focal length f. The image is located • behind the mirror, between 2f and the mirror. • behind the mirror, between 2f and infinity. • in front of the mirror, between the mirror and f. • in front of the mirror, between f and the center of curvature. • in front of the mirror, between the center of curvature and infinity.

19. An object is placed between 2f and infinity in front of a concave mirror of focal length f. The image is located • behind the mirror, between 2f and the mirror. • behind the mirror, between 2f and infinity. • in front of the mirror, between the mirror and f. • in front of the mirror, between f and the center of curvature. • in front of the mirror, between the center of curvature and infinity.

20. Dentists often use concave mirrors to see better. In order for the mirror to produce an enlarged image of a tooth, the tooth must be placed • at the focal point of the mirror. • further than the focal point of the mirror. • closer than the focal point of the mirror.

21. Dentists often use concave mirrors to see better. In order for the mirror to produce an enlarged image of a tooth, the tooth must be placed • at the focal point of the mirror. • further than the focal point of the mirror. • closer than the focal point of the mirror.

22. A real object in front of a concave spherical mirror can produce an image that is • virtual, inverted, and magnified. • real, upright, and magnified. • diminished, upright, and virtual. • magnified, upright, and virtual. • diminished, real, and upright.

23. A real object in front of a concave spherical mirror can produce an image that is • virtual, inverted, and magnified. • real, upright, and magnified. • diminished, upright, and virtual. • magnified, upright, and virtual. • diminished, real, and upright.

24. When a real object is placed just inside the focal point F of a diverging lens, the image is • virtual, upright, and diminished. • real, inverted, and enlarged. • real, inverted, and diminished. • virtual, upright, and enlarged. • virtual, inverted, and diminished.

25. When a real object is placed just inside the focal point F of a diverging lens, the image is • virtual, upright, and diminished. • real, inverted, and enlarged. • real, inverted, and diminished. • virtual, upright, and enlarged. • virtual, inverted, and diminished.

26. A positive lens has a focal length f. The only way to get a magnification of –1 is to • place a real object at the focal point. • place a real object at a distance 2f from the lens. • place a real object at a distance 3f from the lens. • Magnifications from a positive lens can never be negative. • None of these is correct.

27. A positive lens has a focal length f. The only way to get a magnification of –1 is to • place a real object at the focal point. • place a real object at a distance 2f from the lens. • place a real object at a distance 3f from the lens. • Magnifications from a positive lens can never be negative. • None of these is correct.

28. A positive lens has a focal length f. The image is the same size as the object when • the object is at the focal point. • the image is on the opposite side of the lens from the object and is the same distance from the lens as the object. • the image is on the same side of the lens as the object and is the same distance from the lens as the object. • The image can never be the same size as the object. • None of these is correct.

29. A positive lens has a focal length f. The image is the same size as the object when • the object is at the focal point. • the image is on the opposite side of the lens from the object and is the same distance from the lens as the object. • the image is on the same side of the lens as the object and is the same distance from the lens as the object. • The image can never be the same size as the object. • None of these is correct.

30. Which of the following statements is false? • The image produced by a diverging lens is always virtual, upright and reduced in size. • The image produced by a converging lens can be virtual, upright and magnified in size. • The image produced by a converging lens cannot be virtual, upright and reduced in size. • The image produced by a converging lens cannot be real, inverted and reduced in size.

31. Which of the following statements is false? • The image produced by a diverging lens is always virtual, upright and reduced in size. • The image produced by a converging lens can be virtual, upright and magnified in size. • The image produced by a converging lens cannot be virtual, upright and reduced in size. • The image produced by a converging lens cannot be real, inverted and reduced in size.

32. To project an image onto a screen using a lens, • the lens must be diverging and the object must be farther from the lens than the second focal point. • the lens must be converging and the object must be between the first focal point and the lens. • the lens must be diverging and the image must be farther from the lens than the second focal point. • the lens must be converging and the object must be farther from the lens than the first focal point. • the lens must be diverging and the object must be between the first focal point and the lens.

33. To project an image onto a screen using a lens, • the lens must be diverging and the object must be farther from the lens than the second focal point. • the lens must be converging and the object must be between the first focal point and the lens. • the lens must be diverging and the image must be farther from the lens than the second focal point. • the lens must be converging and the object must be farther from the lens than the first focal point. • the lens must be diverging and the object must be between the first focal point and the lens.

34. A converging lens and a screen are so arranged that an image of the sun falls on the screen. The distance from the lens to the screen is • the focal length. • the object distance. • the magnifying power. • one-half the radius of curvature of one of the lens faces. • the average radius of curvature of the two lens faces.

35. A converging lens and a screen are so arranged that an image of the sun falls on the screen. The distance from the lens to the screen is • the focal length. • the object distance. • the magnifying power. • one-half the radius of curvature of one of the lens faces. • the average radius of curvature of the two lens faces.

36. A concave (diverging) lens can produce an image that is • virtual, inverted, and magnified. • real, upright, and magnified. • diminished, upright, and virtual. • magnified, upright, and virtual. • diminished, real, and upright.

37. A concave (diverging) lens can produce an image that is • virtual, inverted, and magnified. • real, upright, and magnified. • diminished, upright, and virtual. • magnified, upright, and virtual. • diminished, real, and upright.

38. In order for a lens to produce a real image, the light rays from the object must • actually be focused at the image location • come to a stop at the image location. • appear to be focused at the image location. • first travel in a straight line parallel to the axis.

39. In order for a lens to produce a real image, the light rays from the object must • actually be focused at the image location • come to a stop at the image location. • appear to be focused at the image location. • first travel in a straight line parallel to the axis.

40. One ray is shown as it leaves an object placed before a positive lens. If this ray were continued to show its path through the lens, it would pass through which point? (F marks the two focal points.)

41. One ray is shown as it leaves an object placed before a positive lens. If this ray were continued to show its path through the lens, it would pass through which point? (F marks the two focal points.)