Light and Our World

1. Light and Our World Chapter 23 Preview CRCT Preparation

2. CRCT Preparation Chapter 23 1. The table describes the reflection of a dog as seen in four different mirrors. Which image was seen in a concave mirror with the dog standing less than 1 focal length away? Aimage A Bimage B Cimage C Dimage D

3. CRCT Preparation Chapter 23 1. The table describes the reflection of a dog as seen in four different mirrors. Which image was seen in a concave mirror with the dog standing less than 1 focal length away? Aimage A Bimage B Cimage C D image D

4. CRCT Preparation Chapter 23 2. Which image described in the table is a real image? Aimage A Bimage B Cimage C Dimage D

5. CRCT Preparation Chapter 23 2. Which image described in the table is a real image? Aimage A B image B Cimage C Dimage D

6. CRCT Preparation Chapter 23 3. When Greg stands on a spot in front of a funhouse mirror, he cannot see a clear image of himself. What conclusion can Greg draw about the mirror and his position in front of it? AGreg is located more than 1 focal length away from a concave mirror. BGreg is located less than 1 focal length away from a convex mirror. CGreg is located at the focal point of a concave mirror. DGreg is located directly between two plane mirrors.

7. CRCT Preparation Chapter 23 3. When Greg stands on a spot in front of a funhouse mirror, he cannot see a clear image of himself. What conclusion can Greg draw about the mirror and his position in front of it? AGreg is located more than 1 focal length away from a concave mirror. BGreg is located less than 1 focal length away from a convex mirror. C Greg is located at the focal point of a concave mirror. DGreg is located directly between two plane mirrors.

8. CRCT Preparation Chapter 23 4. Jordan is nearsighted. Which of the following describes how lenses are used to correct her vision, so that she can focus on objects that are far away? AThe concave lenses in Jordan’s eyeglasses refract the light outward. The convex lenses in her eyes focus the refracted light onto her retinas. BThe convex lenses in Jordan’s eyeglasses focus the light inward. The convex lenses in her eyes focus the refracted light onto her retinas. CThe concave lenses in Jordan’s eyeglasses refract the light outward. The concave lenses in her eyes focus the refracted light onto her retinas. DThe convex lenses in Jordan’s eyeglasses focus the light inward. The concave lenses in her eyes focus the refracted light onto her retinas.

9. CRCT Preparation Chapter 23 4. Jordan is nearsighted. Which of the following describes how lenses are used to correct her vision, so that she can focus on objects that are far away? A The concave lenses in Jordan’s eyeglasses refract the light outward. The convex lenses in her eyes focus the refracted light onto her retinas. BThe convex lenses in Jordan’s eyeglasses focus the light inward. The convex lenses in her eyes focus the refracted light onto her retinas. CThe concave lenses in Jordan’s eyeglasses refract the light outward. The concave lenses in her eyes focus the refracted light onto her retinas. DThe convex lenses in Jordan’s eyeglasses focus the light inward. The concave lenses in her eyes focus the refracted light onto her retinas.

10. CRCT Preparation Chapter 23 5. Kenneth drew the diagram of a helium-neon laser during a lab experiment. What is the purpose of the mirrors inside a laser? AThe mirrors bring the light into focus. BThe mirrors reflect photons back through the tube. CThey filter all but one wavelength of light. DThey heat the atoms into an excited state.

11. CRCT Preparation Chapter 23 5. Kenneth drew the diagram of a helium-neon laser during a lab experiment. What is the purpose of the mirrors inside a laser? AThe mirrors bring the light into focus. B The mirrors reflect photons back through the tube. CThey filter all but one wavelength of light. DThey heat the atoms into an excited state.

12. CRCT Preparation Chapter 23 6. What would happen if Kenneth passed the red light from the laser through a glass prism? AThe resulting light would be red. BThe resulting light would be white. CThe light would be split to form a rainbow. DThe light would not pass through.

13. CRCT Preparation Chapter 23 6. What would happen if Kenneth passed the red light from the laser through a glass prism? A The resulting light would be red. BThe resulting light would be white. CThe light would be split to form a rainbow. DThe light would not pass through.

14. CRCT Preparation Chapter 23 7. Which of the following statements about Kenneth’s diagram is correct? A Laser light contains light waves of many wavelengths. BLaser light contains light waves of many colors. CLaser light is tightly focused and does not spread out much. DLaser light spreads out a lot, even over short distances.

15. CRCT Preparation Chapter 23 7. Which of the following statements about Kenneth’s diagram is correct? A Laser light contains light waves of many wavelengths. BLaser light contains light waves of many colors. C Laser light is tightly focused and does not spread out much. DLaser light spreads out a lot, even over short distances.

16. CRCT Preparation Chapter 23 8. Side mirrors on cars are convex mirrors. What would you see if you put your face very close to a side mirror? Aa larger real image of your face, right side up Ba smaller virtual image of your face, right side up Ca larger virtual image of your face, right side up Da smaller real image of your face, upside down

17. CRCT Preparation Chapter 23 8. Side mirrors on cars are convex mirrors. What would you see if you put your face very close to a side mirror? Aa larger real image of your face, right side up B a smaller virtual image of your face, right side up Ca larger virtual image of your face, right side up Da smaller real image of your face, upside down

18. CRCT Preparation Chapter 23 9. A slide projector makes a small image larger as it projects the image onto a screen. How does a slide projector magnify an image? AThe projector uses a convex lens. BThe projector uses a convex mirror. CThe projector uses a concave lens. DThe projector uses a concave mirror.

19. CRCT Preparation Chapter 23 9. A slide projector makes a small image larger as it projects the image onto a screen. How does a slide projector magnify an image? A The projector uses a convex lens. BThe projector uses a convex mirror. CThe projector uses a concave lens. DThe projector uses a concave mirror.

20. CRCT Preparation Chapter 23 10. Carrie creates a simple camera with a concave lens. What happens when she takes pictures with the camera?

21. CRCT Preparation Chapter 23 10. Answer – The lens of a normal camera is a convex lens that focuses light on the film. A concave lens bends light, so that the light spreads out. Because light rays never meet, a concave lens cannot form a real image. Only a real image can be projected onto film. Therefore, Carrie’s camera cannot produce pictures.

22. CRCT Preparation Chapter 23 11. Describe two ways in which laser light differs from nonlaser light.

23. CRCT Preparation Chapter 23 11. Answers may include: • Laser light is tightly focused, but nonlaser light spreads out. • Laser light contains light waves of one wavelength (color), but nonlaser light contains light of many wavelengths (colors). • Laser light is produced by stimulated emission, but nonlaser light is not. • Laser light is coherent; the light waves move together as they travel away from their source. Individual waves behave as one wave.