light and our world

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Light and Our World

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Chapter 23

CRCT Preparation

Chapter 23 CRCT Preparation

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?

A image A

B image B

C image C

D image D

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?

A image A

B image B

C image C

D image D

2. Which image described in the table is a real image?

A image A

B image B

C image C

D image D

2. Which image described in the table is a real image?

A image A

B image B

C image C

D image D

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?

A Greg is located more than 1 focal length away from a concave mirror.

B Greg is located less than 1 focal length away from a convex mirror.

C Greg is located at the focal point of a concave mirror.

D Greg is located directly between two plane mirrors.

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?

A Greg is located more than 1 focal length away from a concave mirror.

B Greg is located less than 1 focal length away from a convex mirror.

C Greg is located at the focal point of a concave mirror.

D Greg is located directly between two plane mirrors.

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.

B The convex lenses in Jordan’s eyeglasses focus the light inward. The convex lenses in her eyes focus the refracted light onto her retinas.

C The concave lenses in Jordan’s eyeglasses refract the light outward. The concave lenses in her eyes focus the refracted light onto her retinas.

D The convex lenses in Jordan’s eyeglasses focus the light inward. The concave lenses in her eyes focus the refracted light onto her retinas.

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.

B The convex lenses in Jordan’s eyeglasses focus the light inward. The convex lenses in her eyes focus the refracted light onto her retinas.

C The concave lenses in Jordan’s eyeglasses refract the light outward. The concave lenses in her eyes focus the refracted light onto her retinas.

D The convex lenses in Jordan’s eyeglasses focus the light inward. The concave lenses in her eyes focus the refracted light onto her retinas.

5. Kenneth drew the diagram of a helium-neon laser during a lab experiment. What is the purpose of the mirrors inside a laser?

A The mirrors bring the light into focus.

B The mirrors reflect photons back through the tube.

C They filter all but one wavelength of light.

D They heat the atoms into an excited state.

5. Kenneth drew the diagram of a helium-neon laser during a lab experiment. What is the purpose of the mirrors inside a laser?

A The mirrors bring the light into focus.

B The mirrors reflect photons back through the tube.

C They filter all but one wavelength of light.

D They heat the atoms into an excited state.

6. What would happen if Kenneth passed the red light from the laser through a glass prism?

A The resulting light would be red.

B The resulting light would be white.

C The light would be split to form a rainbow.

D The light would not pass through.

6. What would happen if Kenneth passed the red light from the laser through a glass prism?

A The resulting light would be red.

B The resulting light would be white.

C The light would be split to form a rainbow.

D The light would not pass through.

7. Which of the following statements about Kenneth’s diagram is correct?

A Laser light contains light waves of many wavelengths.

B Laser light contains light waves of many colors.

C Laser light is tightly focused and does not spread out much.

D Laser light spreads out a lot, even over short distances.

7. Which of the following statements about Kenneth’s diagram is correct?

A Laser light contains light waves of many wavelengths.

B Laser light contains light waves of many colors.

C Laser light is tightly focused and does not spread out much.

D Laser light spreads out a lot, even over short distances.

8. Side mirrors on cars are convex mirrors. What would you see if you put your face very close to a side mirror?

A a larger real image of your face, right side up

B a smaller virtual image of your face, right side up

C a larger virtual image of your face, right side up

D a smaller real image of your face, upside down

8. Side mirrors on cars are convex mirrors. What would you see if you put your face very close to a side mirror?

A a larger real image of your face, right side up

B a smaller virtual image of your face, right side up

C a larger virtual image of your face, right side up

D a smaller real image of your face, upside down

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.

B The projector uses a convex mirror.

C The projector uses a concave lens.

D The projector uses a concave mirror.

Chapter 23

CRCT Preparation

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.

B The projector uses a convex mirror.

C The projector uses a concave lens.

D The projector uses a concave mirror.

10. Carrie creates a simple camera with a concave lens. What happens when she takes pictures with the camera?

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.

11. Describe two ways in which laser light differs from nonlaser light.

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.

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