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    Just got home, how was the exam anyone, i thought it went quite well?
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    I did Unit 1 and Unit 2. Unit 1 was really easy but unit 2 wasn't too good am looking forward to the resit already!
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    I took PSA1 in Jan and resat it and did PSA2 on Friday. I thought they were quite easy compared to usual, I'm just not sure I did the ray diagram right... f = -1/3m, so do you do the diagram as if it's 1/3m and you get a slightly smaller object on the other side of the lens?

    Why were the trees 'all wobbly'?
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    I got a smaller object on the same side of the lens. The two rays I drew were the one going straight through the middle and the one going parallel and then bending upwards - I drew construction lines going back from where it pointed up so it intersected with the ine going straight through the middle. Hmm I didn't explain thta very well...

    As for the trees being wobbly, I said the heated air doesn't have a uniform thickness so some rays will have to go through more of the heated air than other so will be refracted more.
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    I got what you meant... oh dear, I did it as if it was a positive focal length. Still I should get most of the marks.
 
 
 
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