Posts Tagged ‘angle of incidence’

Refraction

Friday, April 29th, 2011

refraction by the_green_squirrel

All waves refract.  This means that they change speed as they travel from one medium to another.  For example, light waves travel faster in air than they do in water.  This means the pencil in the glass of water looks like the picture on the right.  For a full explanation of refraction, read this.  Hopefully you now understand the concept.  If not, ask this archer fish to explain it to you!

We will do a lab to investigate refraction of light as it passes through glass and perspex, and to determine the refractive indices of these substances.  This handout (thank you Mr Duckworth) explains in more detail. Grade-9-Integrated-Science-Waves-Topic-refraction1

You will be required to submit the data tables, calculations and graphs for this lab only.  Refer to this rubric: FINALRubric DCP

Reflection

Friday, April 29th, 2011

wing mirror by Izzard on flickr

All waves are reflected when they hit a surface or barrier.  The angle at which the wave is reflected is not random, but predictable.  We will investigate angles of incidence (i) and angles of reflection (r) of light waves hitting a plane mirror and try to answer these questions about light and reflection:-

  • Light travels in straight lines.  What evidence can you think of that shows this?
  • What is a virtual image?
  • What does laterally inverted mean?

This link gives some basic information to start with.  This one gives a bit more detail.