Stuff for next class

Quiz (E):  Thursday
Quiz (A):  Friday

Quiz is on:  Snell's law, index of refraction, etc.  Possible question about focal length.  Possible practical part.

After you have done both the lens and mirror parts of the lab, start to look at your data for trends:

Is there a point where images go from bigger to smaller, real to virtual, etc.?  Is this related to the approximate focal length (measured at the beginning of the trials?  Start to think and write about this.  Hint - there IS something to be seen, even if it's tough to tell from your data.

Check out this applet:

http://www.physics.metu.edu.tr/~bucurgat/ntnujava/Lens/lens_e.html

Move the object (arrow) and note what happens to the image.  Think about this as it relates to your lab.

If you have time, start to calculate experimental focal lengths with your data (for convex lenses and concave mirrors), using the mirror/lens equation.  Are these close to the approximate f (from outside)?  Start thinking about sources of error.