Mirrors/lens help!!

[MD2behopefully]

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I take the test in 6 days for my charming second time. I have done pretty good (at least by my standards) ranging 28-32 usually scoring PS: 8 or 9 (but sometimes 10 or 11 and sometimes a 7!!) VR:10-11 and BS: 10-11.

My PS score varies SO incredibly much bc its dependent on what passages i get. There are just some topics that literally scare the **** out of me, I freak out, and the rest of the test plays out in a similar fashion to the end of a Mortal Combat game, and the test inevitably makes me her bitch... over and over and over again. One of these topics is Lens and Mirrors.

I really dont think the rest of the world perceives them like this and they are probably in all actuality easy, but I can not fully grasp them at ALL!! I have read the EK and Kaplan sections on them over and over again as well as the mcat-review.org section yet they all still have a post-it on them that says "WTF?". I dont know if the gold standard, TBR, or TPR have good info on them, but EK and Kaplan's explanation looses me.

DOES ANYONE HAVE A GOOD VIDEO OR LINK OR ANYTHING THAT CAN EXPLAIN THEM TO ME?!?!?! PLEASE!!! I can memorize the equations:
M = magnification = - i/o
1/ i + 1/ o = 1/ f = 2/r = Power
My problem lies in understanding what the i, o, and f is and how to pull it out of the question or passage. As well as when to apply them to mirrors vs lens.

Thanks

 

[PingPongPro]

Try searching for a pdf that "kehlsh" made. I think he tried to teach lens/mirrors through the pdf. I haven't gone through it myself, but I think I've heard people say good things about it.

 

[BerkReviewTeach]

I take the test in 6 days for my charming second time. I have done pretty good (at least by my standards) ranging 28-32 usually scoring PS: 8 or 9 (but sometimes 10 or 11 and sometimes a 7!!) VR:10-11 and BS: 10-11.

My PS score varies SO incredibly much bc its dependent on what passages i get. There are just some topics that literally scare the **** out of me, I freak out, and the rest of the test plays out in a similar fashion to the end of a Mortal Combat game, and the test inevitably makes me her bitch... over and over and over again. One of these topics is Lens and Mirrors.

I really dont think the rest of the world perceives them like this and they are probably in all actuality easy, but I can not fully grasp them at ALL!! I have read the EK and Kaplan sections on them over and over again as well as the mcat-review.org section yet they all still have a post-it on them that says "WTF?". I dont know if the gold standard, TBR, or TPR have good info on them, but EK and Kaplan's explanation looses me.

DOES ANYONE HAVE A GOOD VIDEO OR LINK OR ANYTHING THAT CAN EXPLAIN THEM TO ME?!?!?! PLEASE!!! I can memorize the equations:
M = magnification = - i/o
1/ i + 1/ o = 1/ f = 2/r = Power
My problem lies in understanding what the i, o, and f is and how to pull it out of the question or passage. As well as when to apply them to mirrors vs lens.

Thanks

There's a post in the Q and A forum from maybe a year ago that explains the BR method for doing lenses and mirrors. It's pretty amazing in how simple it is. It'll be the most useful thing you'll find, especially on short notice. I'd search "mirrors berkeley" or something like that.

 

[BerkReviewTeach]

MD2behopefully,

I've searched a couple different ways and can't find that thread. Here are four threads that address the BR method applied to some answer solutions, but unfortunately they're not as good as the thread I wanted to find.

Farsightedness question

Convex vs. Concave Lens

Shortcut Version of Thin Lens Equation

Double Lens/Mirror

 

[muhali3]

i = (o x f) / (o - f) -- another one of BR's golden calculation tricks. just remember that f is positive for converging systems and negative for diverging.

 

[Swagster]

^ I second this. You can find out more about it in the later posts in Kehlsh's thread on optics. Post 45 or so by Muhali.