<p>I didn't know where else to put this thread. I know a lot of you are busy with the SAT's coming up.</p>
<p>Basically, I suck at physics. I love math, problem solving, and chem. Physics just kills me.</p>
<p>So we've covered light duality, penumbra, plane mirrors (including locating obj. using parallax), convex and concave mirrors.</p>
<p>Convex, -cave mirrors no problem, I got the equations and the ray diagrams (yay, no explanations). Probably most of the test. Plane mirrors I'm a bit iffy on. Not very good understanding parallax. I forgot what penumbra was.</p>
<p>Basically, I need some helpful resources on basic geometric optics. I've tried physics classroom online, did not help much.</p>
<p>Plane mirrors are the easiest part. The image distance is always going to be the same as the object distance, and the same thing for height. Look at the sparknotes link baphomet posted for more info. Optics isnt really hard. In my opinion its probably one of the easiest sections int he curriculum.</p>
<p>I'd say waves are the easiest part.
Anyway....
Convex are similar to Concave ones except the focal point is INSIDE the mirror.
So parallel still refract to the focal point (you'll see a dotted line to the focal point but that is to follow for when you draw the real line which should be on the object side), and rays to the focal point reflect parallel. If you want diagrams I guess I can find some and give explanations, or you can post yours and I can try to explain.</p>
<p>No, I got bashed with enough concave/convex mirrors so I'm pretty comfortable with all the cases, their ray diagrams, and the math involved for finding various lengths.</p>
<p>MrPanchioni or someone else, can you explain penumbra and using parallax to locate the image? I'll probably look it up later anyways. I'm actually pretty happy that the focus of the test will be on concave/vex mirrors and that there will be more math than explanations. Thanks for the responses.</p>