<p>for the prism one i said it would bend but come out as white light… i wanna say that was D?</p>
<p>really? why wouldn’t it disperse into colors?
haha I just left that one blank… :</p>
<p>ooh, did anyone get that mirror question? about what body parts would he see if he was 0.5 m away? I feel like it’s supposed to be an easy question… but I was was still really confused by it…</p>
<p>It wouldn’t disperse because the speed of light in the prism is the same for all wavelengths.</p>
<p>As for the mirror, I thought that he couldn’t see his knees. Also, he should see less of himself if the mirror is farther away because it’s a plane mirror.</p>
<p>hmm… that’s what I thought, but then how do prisms usually disperse light then? haha I got kind of confused by that… oops :</p>
<p>Usually different wavelengths go through a prism material at different speeds, so they disperse because each wavelength is refracted differently.</p>
<p>Another question. For the film on glass, what answer was it? I put diffraction. :/</p>
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<p>i put that knees could be seen since he’s standing somewhat away from the mirror…</p>
<p>and he would see more of himself because as you back away from a plane mirror you could see more of yourself going from your head to toes…</p>
<p>confirmations?</p>
<p>yeah, I put you would see more as you back away from the mirror… I’m not sure though, I was just basing that off of what happens when I back away from my bathroom mirror haha</p>
<p>i put diffraction as well</p>
<p>pianoman: Yes I agree that the answer is E. In fact, it’s much due to total internal reflection. Though, I can’t really explain how either. I know that it impossible since it travels from a less dense area to a more dense one. Cross fingers!</p>
<p>I think the telescope one has to do with size of the lens with permits more intensity. Ain’t sure too. =(</p>
<p>sigh… I’m just hoping for above a 740 :)</p>
<p>anyone remember the question about a compass needle over a wire?</p>
<p>Wait, E is the answer to what?</p>
<p>what graph did you guys pick for the frequency question where the graphs were supposed to be out of phase</p>
<p>… can’t remember what letter it was, but basically the one where the waves looked the same but one was in front of the other? (if that made any sense haha)</p>
<p>why that one? were both waves moving?</p>
<p>For the compass over the current going through a wire, it’s pointing to the left.</p>
<p>Argh I thought you see less of yourself. I drew a bunch of ray diagrams. Looks I did something wrong.</p>
<p>@oblivi0n, I’m not sure… I thought that that’s what out of phase meant? :\ like the peaks and troughs don’t match up?</p>
<p>I used the right hand rule. I followed the direction of the current. I realized that South is opposite the direction of the current and North is in the same direction. So, I chose the same direction as the current. </p>
<p>EPIC DUMB! </p>
<p>I totally forgotten how magnetic field works. So, I resorted to that. I don’t think I am correct.</p>
<p>^ aren’t you supposed to use the thumb rule?</p>
<p>Yes I used the thumb rule but I did not remember if the compass follows the direction of which: force or pole or wateva.</p>
<p>Thinking back, I should have chosen pointing to the left. </p>
<p>My reasoning that it should point in the same direction of current is totally far-fetched</p>
<p>EDIT: Im freaking out even now that I wrote the rule wrongly. Thanks for pointing out</p>
<p>I thought it’s the same right-hand rule for torque, with your thumb being the current and the curl of your fingers being the magnetic field.</p>