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Eighth Grade (Grade 8) Light and Optics Questions

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Grade 8 Light and Optics
Which part of the eye contains photoreceptor cells called rods and cones?
  1. Cornea
  2. Pupil
  3. Retina
  4. Optic nerve
Grade 8 Light and Optics
What type of images do concave lenses form?
  1. Real images
  2. Enlarged images
  3. Virtual images
  4. Focal images
Grade 8 Light and Optics
Why do dark-colored clothes feel warmer on a sunny day?
  1. They reflect more light
  2. They absorb more light and transform it into heat
  3. They scatter light in all directions
  4. They emit their light
Grade 8 Light and Optics
What is the law of incidence in reflection?
  1. The angle of incidence is equal to the angle of reflection
  2. The angle of incidence is greater than the angle of reflection
  3. The angle of incidence is smaller than the angle of reflection
  4. The angle of incidence is unrelated to the angle of reflection
Grade 8 Light and Optics
                is formed in a plane mirror.
  1. Real image
  2. Virtual image
  3. Inverted image
  4. Enlarged image
Grade 8 Light and Optics
Farsightedness can usually be corrected by                .
  1. convex lenses
  2. convex mirrors
  3. concave mirrors
  4. concave lenses
Grade 8 Light and Optics
The                       occurs when light strikes on rough or uneven surfaces?
  1. Regular reflection
  2. Diffuse reflection
  3. Specular reflection
  4. Absorptive reflection
Grade 8 Light and Optics
During diffuse reflection, the light rays                             .
  1. maintain a uniform direction
  2. bounce back predictably
  3. scatter in various directions
  4. emit their own light
Grade 8 Light and Optics
What is the key difference between infrared waves and microwaves?
  1. Infrared waves have shorter wavelengths and higher frequencies than microwaves.
  2. Infrared waves have longer wavelengths and lower frequencies than microwaves.
  3. Infrared waves cannot penetrate materials.
  4. Infrared waves are used for cooking food.
Grade 8 Light and Optics
In which optical devices are convex lenses commonly used to focus real images?
  1. Telescopes
  2. Binoculars
  3. Eyeglasses
  4. All of the above
Grade 8 Light and Optics
What type of images can convex mirrors form?
  1. Real and virtual
  2. Only real
  3. Only virtual
  4. None of the above
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 causes the phenomenon where images in mirrors are reversed horizontally?
  1. Refraction
  2. Dispersion
  3. Reflection
  4. Diffraction
Grade 8 Light and Optics
Incandescent light sources emit a significant amount of                  .
  1. Sound
  2. thermal energy
  3. visible light
  4. ultraviolet light
Grade 8 Light and Optics
What color of light do you observe when you look through a colored transparent object?
  1. All colors of light
  2. Only the color that the object reflects
  3. The color that was absorbed by the object
  4. The color that was transmitted through the material
Grade 8 Light and Optics
Why does a red apple appear red?
  1. Because it emits red light
  2. Because it absorbs all colors of light
  3. Because it reflects red light and absorbs all other colors
  4. Because it contains red pigments
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