the ray model of light

• Light travels in straight lines
• intro .
• what is incident light?

  wheh light is emitted from a source and strikes an object
• what is transparency?

  when an object transmits all or almost all incident light
• what is translucency?

  when an object transmits some incident light but reflects/absorbs the rest
• what is opacity?

  when an objects doesn't transmit any incident light
• flat mirrors
• what is a mirror?

  a polished surface that exhibits reflection
• what is a reflection?

  light bouncing back from a surface
• the two parts of a mirror

  glass at the front, thin sheet of reflective silver or aluminium at the back
• terminology of reflection
• what is a normal?

  a line perpendicular to the mirror surface
• what is the angle of incidence?

  angle between the incident ray and the normal ray. same for incident and reflection ray
• what is the incident ray?

  where the light travels towards the mirror
• what is the reflection ray?

  the direction the light bounces off the mirror