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Eighth Grade (Grade 8) Light and Optics Questions

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Grade 8 Light and Optics
Conduction always produces light.
  1. True
  2. False
Grade 8 Light and Optics
Which of the following processes does NOT produce light?
  1. bioluminescence
  2. conduction
  3. incandescence
  4. phosphorescence
Grade 8 Light and Optics
What are polarizing filters used for in the polarization of light?
  1. To generate light waves.
  2. To block all light waves.
  3. To allow only certain light waves to pass through.
  4. To change the direction of light waves.
Grade 8 Light and Optics
Which of the following is an application of lasers?
  1. Sewing fabric
  2. Cooking food
  3. Correcting vision
  4. Generating electricity
Grade 8 Light and Optics
Chromaticity is not the property of laser light.
  1. True
  2. False
Grade 8 Light and Optics
What is the unique property of laser light related to its light waves?
  1. Incoherent light waves
  2. Irregular light patterns
  3. Phase coherence
  4. Low power density
Grade 8 Light and Optics
What is the purpose of the optical resonator in a laser?
  1. To create laser light
  2. To amplify light
  3. To focus laser light
  4. To reflect laser light
Grade 8 Light and Optics
What is the primary function of the lens in a camera?
  1. To control the aperture size
  2. To store images
  3. To focus light onto the film
  4. To control the shutter speed
Grade 8 Light and Optics
True color blindness, where a person can see only in black and white, is                 .
  1. Very common
  2. Moderately common
  3. Extremely rare
  4. Fairly common
Grade 8 Light and Optics
What is the most common type of color blindness, where individuals have trouble distinguishing shades of red and green?
  1. Blue-yellow color blindness
  2. Red-green color blindness
  3. Black-white color blindness
  4. Green-blue color blindness
Grade 8 Light and Optics
How does a concave lens affect parallel light rays?
  1. It converges them toward the center.
  2. It refracts them toward the center.
  3. It causes them to spread apart.
  4. It bends them towards each other.
Grade 8 Light and Optics
Concave mirrors form virtual and blurry images.
  1. True
  2. False
Grade 8 Light and Optics
What happens when an object is placed at the focal point of a concave mirror?
  1. A real image is formed
  2. A virtual image is formed
  3. No image is formed
  4. The object disappears
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