Phryday!

B Block took on the challenge of color and polarization today. We looked at the additive and subtractive color systems and looked at a few demonstrations to see how additive color works for televisions and computer screens and subtractive color systems work using a spectrophotometer. We then hit polarization and discussed how light could become polarized through passing through a filter, reflection or scattering. We also took time to look at how a polarizing filters could be used to block previously-polarized light and how that related to sunglasses and camera lenses. On Monday, a lab about light intensity and polarization.

C Block worked on their light intensity and polarization labs today and found, as expected, that the relationship between light intensity and distance is an inverse-square one. We spent enough time on that between sound and the first part of this chapter that it should be pretty easy to write the Conclusion part of your write-up for that piece of the lab. For polarization, you used one filter to polarize light and a second (the analyzer) to demonstrate how light penetration changes with angle of analyzer. The sunglasses lens showed the same pattern, so both nicely followed Malus's law, which we'll touch on in class Monday.

E and F Blocks discussed curved mirrors in class, both concave and convex, and how examined how these mirror types formed images. We contrasted real with virtual images, explained how to use the mirror equation and magnification formulas and looked at how to draw ray diagrams for these mirror types. Remember that you are only responsible for drawing ray diagrams for concave lenses forming real images, but be sure you can do that quite well for the test. On Monday, we take a look at color and polarization.