Posts Tagged ‘refraction’

Lenses and ray diagrams

Thursday, May 12th, 2011

telescope by Waifer X on flickr

Here are links to a couple of sites on ray diagrams.  This first one is factual.  This one is interactive, and covers the different types of image obtained when you place your object various distances from the the lens.  And this site (Thanks for finding it Mr Goodman) is really useful.

Make sure you know the difference between a real and virtual image, an inverted and an upright image, and a magnified and diminished image.

Now that you know all about refraction, and how light bends as it passes through lenses, it’s time to take a look at where we use lenses in our daily (or not so daily) lives.  Microscopes, telescopes, cameras, binoculars, all contain at least one lens.  Your task is to select one application of lenses and do some research on it.  Prepare a glogster poster of your findings.  You must explain what type or types of lenses are present, what refraction has to do with your chosen application, and how it works.  Follow the links here to help get you started.

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

Lenses glogs

Thursday, May 20th, 2010

Canon FL 55mm f1.2 by Arkku on flickr

You can check out each other’s work by clicking on the links below.  You can learn from each other!  Feel free to give each other feedback by leaving a comment.

  • Sam                                 Grace
  • Karenina                       Daniel
  • Justin                             Tyler
  • Mumba                          Carlo
  • Danilo                             Hiram
  • David                              Timmy
  • Anushay                        Kevin
  • JP                                     Davis
  • Adrian                            Ethan
  • John                                Stefan
  • Sandy                              William
  • Bianca                             Agustin
  • Trix                                  Ines
  • Sera                                  Gaby
  • Gabby                             Juliana
  • Nish                                 Emily

Application of lenses

Thursday, May 13th, 2010

telescope by Waifer X on flickr

Here are links to a couple of sites on ray diagrams.  This first one is factual.  This one is interactive, and covers the different types of image obtained when you place your object various distances from the the lens. 

Make sure you know the difference between a real and virtual image, an inverted and an upright image, and a magnified and diminished image.

Now that you know all about refraction, and how light bends as it passes through lenses, it’s time to take a look at where we use lenses in our daily (or not so daily) lives.  Microscopes, telescopes, cameras, binoculars, all contain at least one lens.  Your task is to select one application of lenses and do some research on it.  Prepare a glogster poster of your findings.  You must explain what type or types of lenses are present, what refraction has to do with your chosen application, and how it works.  Follow the links here to help get you started.

Refraction of light

Monday, April 19th, 2010
refraction by Moh_Tj on flickr

refraction by Moh_Tj on flickr

We’re going to learn about refraction and how it happens.  Thanks to Mr Duckworth for producing these notes to help us. Grade 9 Integrated Science Waves Topic – refraction  

We’ll also be doing a lab to collect some data and find out the refractive index of glass and perspex.  The rubric is here: Pre IB Lab Rubric 08 – 09  You will be assessed on the data collection and processing part only.