BR this lens equation

[dougkaye]

Does anyone have the BR thin lens simplified equation?

I think it's di = (f x do) / f - do, but I'm not sure if I derived it correctly.

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[BerkReviewTeach]

Does anyone have the BR thin lens simplified equation?

I think it's di = (f x do) / f - do, but I'm not sure if I derived it correctly.

It's Equation 10.12 shown on page 252. Rather than deriving it, try working through Examples 10.8a, 10.8b, 10.10a, and 10.10b, because they show the nuances of the equation. For instance, a common mistake is using a +f for a diverging lens or mirror. As long as you remember to use -f for diverging systems, it's a fast way to determine the image position in your head. Once you do those examples, then you can go back and derive it if you want.

 

[Swagster]

I know this is for MCAT questions, but I want to give a huge shout out to BR for this section. Lenses and mirrors are this quarter, so I've been doing some of the BR problems simultaneously with my regular physics book. I just want to say that their way of doing lenses and mirrors is genius.