Anyone Know How To Make Me Understand Optics?

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willthatsall

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Is there a trick to this, or is it just memorizing the stuff? I didn't pay attention to it in physics and now I can't figure out what the three ray diagrams mean or anything else. All I really understand is 1/o + 1/i = 1/f. Who can help me?
 
willthatsall said:
Is there a trick to this, or is it just memorizing the stuff? I didn't pay attention to it in physics and now I can't figure out what the three ray diagrams mean or anything else. All I really understand is 1/o + 1/i = 1/f. Who can help me?

a) you'll likely not see optics on the mcats
b) optics on the mcats, if it makes an appearance, is ... easy
c) don't bother figuring it out, just memorize the formulas and conditions when they apply; and practice, of course
d) or get some prisms, lenses and mirrors. play with them. visualize. make predictions, examine consequences of position, movement. if you fail at d), go back to c). and stay there.

if you don't know how to proceed with d), see your high-school physics teacher, the guy in charge of physics lab at your university or a grad student in a chemistry department who works with lasers (e.g. electrochem, physical chem, photoinorganic chem, etc.)

oh, and they're all gonna laugh at you.

p.s. it's all a matter of geometry. just try to visualize how the lens structure bends the light, like a .... gravitational field bending space time 🙂

p.p.s. c) is more pragmatic
 
id recommend the ek physics chapter on optics. they have a system that you can memorize and use to solve any optics problem. once you understand the system, its all plug and chug.
 
willthatsall said:
... All I really understand is 1/o + 1/i = 1/f. Who can help me?
That's all you need to know.
Plus, understand where the rays end up after reflection off of a mirror or passing through a lens (those little diagrams), but those are pretty much common sense.

And don't forget about index of refraction, Snell's law, and critical angles; but just the basics. If it comes up, it will be very elementary. 👍
 
u shud get the TPR Physical Sciences Review Book...they explain it really well!!!
 
The other day i saw this girl on some website that had some really good visualizations of optics. It had movies and little games that u could play to learn optics. I didn't ask her what website it was, but does anyone know of any similar website?
 
I had optics on one of my practice mcats, I definitely wouldn't skip it.

Things to understand: refraction and reflection. Diffraction and Interference (probably not on the mcat). Polarizing light (probably not on the MCAT). Equations where v = f*(wave length) and understanding that if the speed changed because you want through a medium the wave length changes but the frequency does not. Knowing that in air (practically a vacuum) c = f(wavelength) and make sure you know c = 3x10^8 m/s.

Know how things bounce off mirrors, know that Image size/object size = - q/p and that that is magnification.

Other stuff.
 
Use EK's system for lens/mirrors. It really works and its very simple to memorize!

-tx
 
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