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Eighth Grade (Grade 8) Light and Optics Questions

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Grade 8 Light and Optics
What is the name of the technology that utilizes optical fibers for data transmission?
  1. Holography
  2. Laser optics
  3. Telecommunication
  4. Fiber optics
Grade 8 Light and Optics
Why does light stay inside an optical fiber over long distances?
  1. Due to refraction
  2. Due to diffraction
  3. Due to total internal reflection
  4. Due to reflection
Grade 8 Light and Optics
What does the term “laser” stand for?
  1. Light Amplification by Solar Energy Radiation
  2. Light Amplification by Stimulated Emission of Radiation
  3. Light Amplification by Reflection of Energy
  4. Light Amplification by Sound Energy Radiation
Grade 8 Light and Optics
What is the role of the optic nerve?
  1. To control the size of the pupil
  2. To refract light
  3. To transmit visual information from the retina to the brain
  4. To process visual information
Grade 8 Light and Optics
What happens to light rays that pass through the center of a convex lens?
  1. They diverge.
  2. They remain straight.
  3. They refract away from the lens.
  4. They converge.
Grade 8 Light and Optics
A laser produces light that                               .
  1. is incoherent
  2. has many different colors
  3. is coherent
  4. has many different wavelengths
Grade 8 Light and Optics
What is the characteristic shape of concave mirrors?
  1. Convex
  2. Flat
  3. Inward-curved (like the inside of a spoon)
  4. Outward-curved (like the back of a spoon)
Grade 8 Light and Optics
What happens to light rays parallel to the optical axis when they enter a concave mirror?
  1. They pass through the mirror's center
  2. They diverge outward
  3. They are reflected through a focal point
  4. They are absorbed by the mirror
Grade 8 Light and Optics
When you look at yourself in a plane mirror, what kind of image is formed?
  1. Inverted image
  2. Upright and magnified image
  3. Virtual image
  4. Transparent image
Grade 8 Light and Optics
Mirrors work on the principle of                   .
  1. Law of diffraction
  2. Law of reflection
  3. Law of refraction
  4. Law of dispersion
Grade 8 Light and Optics
What is the property of plane mirrors regarding the orientation of the reflected image?
  1. They invert the image vertically.
  2. They invert the image horizontally.
  3. They do not change the orientation of the image.
  4. They create a blurry image.
Grade 8 Light and Optics
Why has fluorescent light earned the name “cool light”?
  1. It emits a bluish glow
  2. It produces minimal thermal energy
  3. It generates a warm, amber-colored light
  4. It operates at a lower voltage
Grade 8 Light and Optics
What type of light is produced when thin wires in a toaster become red-hot?
  1. Infrared light
  2. Ultraviolet light
  3. Incandescent light
  4. Fluorescent light
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