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Welcome to blog help for PHY 122! Here's how it works. For each homework question and lab report we will make a post, this will probably contain a few tips on what the problems are about and how to solve them. If you are stuck on something then instead of emailing us directly you should post a comment in reply to the relevant post. We will try to guide you through tough points and help you understand the problems and the concepts behind them.
3 comments:
For these problems make sure you understand the sign conventions for refracting surfaces summarized in Table 23.2 on p. 770 of SV8. I suggest you go carefully through the worked-out examples in Ch. 23.4. Ditto for thin lenses and Table 23.3 on p. 775 and Ch. 23.6. With a "two-lens" problem such as #11, you have to be especially careful about the sign conventions. Think of a two-lens problem this way. Object: you have an object distance p1 to the first lens, and you calculate the image distance q1 for it. The location of that image then becomes the location of the object distance for the second lens, and you measure that object distance p2 from where q1 is to where the second lens is, paying attention to the sign conventions. You then calculate the image distance q2, which is measured from the second lens. For a two-lens problems that's the "final" image, but if you're asked where it is with respect to the first lens (or the original object), you have to figure that out, too. Magnification: there is a magnification M1 for the first lens (in terms of p1 and q1), and then there's a magnification M2 for the second lens (in terms of p2 and q2). The overall magnification M is the product of M1 and M2.
How do I do #9? I know to use the lens maker's equation but I seem to not be getting the right answer anyhow. Please help.
Liza, You're in the wrong thread. Go to the HW: 7-9 thread. Prof. Koch
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