light

• What does opaque mean?

  Not transparent.
• What does translucent mean?


  Allowing light to pass through, but diffusing it so that objects on the other side are not clearly visible.
• What does transparent mean?


  Allowing light to pass through so that objects behind can be distinctly seen.
• What is a luminous object?

  It produces light.
• What is a non-luminous object?

  It reflects light.
• What lines does light travel in?

  Straight lines.