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Grade 4 Revision

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  • Objects that make light bounce off are called...
    Reflectors
  • Which is NOT a light source?
    Rocks
  • A band of light is called a ...
    Beam
  • Identify the ray.
    Reflected ray
    Incoming light ray
  • A ray that hits a surface is called...
    Reflected ray
    Incoming light ray
  • Which of these is translucent?
    Paper
  • Identify the ray.
    Reflected ray
    Incoming light ray
  • Objects that make their own light are called ...
    Light Sources
  • Name the instrument.
    Periscope
  • Surfaces that are better at absorbing light are...
    Smooth
    Rough
  • Which of the following is a light source?
    Clouds
    Moon
    Sun
  • Is this diagram correct? Why or Why not?
    No, the two angles are not the same.
  • A measure of the amount of light in an area.
    Light Intensity
  • Which of the following is NOT a light source?
    Sun
    Stars
    Moon
  • Identify how light travels in a periscope that makes the boy see the bird above him.
    Sun - Bird - Mirror 1 - Mirror 2 - Boy's eyes
  • Light intensity can be measured using a ...
    Protractor
    Ruler
    Lightmeter
  • In the past, people measure light intensity in ...
    Candlepower
  • Identify how light travels that makes the boy to see the chair.
    The light from the bulb travels to the chair. The chair reflects the light to the boy's eyes.
  • Which of these is/ are opaque?
    Pencil
  • Identify how light travels that makes the boy to see the cupcake.
    The light from the candle travels to the cupcake. The cupcake reflects the light to the boy's eyes.
  • Surfaces that are better at reflecting light...
    Rough
    Smooth
  • What does it do to light?
    Absorb
    Reflect
  • A solid image of a person or a scene, the shape of a shadow.
    Silhouette
  • This happens when drops of water in the air are hit by sunlight at a certain angle.
    Rainbow
  • Which of these is transparent?
    Water bottle
  • A ray that bounces off a surface is called...
    Incoming light ray
    Reflected ray
  • It is the process where light is bounced off from a surface, changing its direction.
    Reflection
  • Identify how light travels that makes the girl see the sun.
    The light from the sun travels to the girl's eyes.
  • What does it do to light?
    Absorb
    Reflect
  • Which is better at absorbing light?
    Rocks