Light, shadows and reflection Worksheet-2

Light, shadows and reflection Worksheet-2

 

True/False:

  1. Artificial sources of light are candles, electric bulbs, and laser.
  2. Some insects and deep-sea organisms are considered to be source of natural light.
  3. Different types of materials pass same amount of light through them.
  4. Materials that transmit some amount of light are called translucent materials.
  5. Translucent materials are metals, mud, cement, coal, and wood.
  6. Only an ideal mirror allows any light pass through it.
  7. In biology, propagation is a process by which sound or light waves travel through a medium such as air or water.
  8. A ray is a line with an arrow that shows the direction of propagation of light.
  9. An opaque object blocks the light falling on it.
  10. Only when light rays are obstructed by an opaque object that we get a shadow of the object.

 

Answer Key:

  1. True
  2. True
  3. False

Exp:  Different types of materials pass different amount of light through them.

  1. True
  2. False

Exp: Opaque materials are metals, mud, cement, coal, and wood.

  1. False

Exp: An ideal mirror does not let any light pass through it.

  1. False

Exp: In Physics, propagation is a process by which sound or light waves travel through a medium such as air or water.

  1. True
  2. True
  3. True