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 03-31-2012, 09:43 PM #1 2K Member   Join Date: Apr 2010 Posts: 2,388 images SDN Members don't see this ad. (About Ads) If upright, it is ALWAYS virtual? If upside down, it is ALWAYS real? if so, this will make life a lot easier lol here's hoping.
 03-31-2012, 10:09 PM #2 2K Member   Status: Pre-Medical Join Date: Mar 2010 Location: NY Posts: 2,184 Yeah, virtual is upright, real is inverted. It deals with the equation m = -hi/ho = -di/do __________________ sector9, mauberley, flodhi1, flatearth22, MedPR, Neuronix, Catalystic, LizzyM, PharMed2016, Fencer, DrMidLife, nadaba, Gnomes, thlaxer, [04/28/12 MCAT]: Without them, I could not be where I am now. The most f'ed up, psychotic thing I've ever read on SDN.
03-31-2012, 10:38 PM   #3
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Quote:
 Originally Posted by pfaction Yeah, virtual is upright, real is inverted. It deals with the equation m = -hi/ho = -di/do
wait about in a double lens system where do can be negative and di can be positive.

04-01-2012, 10:46 AM   #4
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Quote:
 Originally Posted by chiddler wait about in a double lens system where do can be negative and di can be positive.
The signs are relative to each other, so I don't think it would matter.

04-01-2012, 09:40 PM   #5
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Quote:
 Originally Posted by chiddler If upright, it is ALWAYS virtual? If upside down, it is ALWAYS real? if so, this will make life a lot easier lol here's hoping.
Thought more about this and it does make it simpler for the MCAT. Any answer choices that are "real and upright" or "virtual and inverted" are wrong!

04-02-2012, 09:24 PM   #6
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Quote:
 Originally Posted by MedPR Thought more about this and it does make it simpler for the MCAT. Any answer choices that are "real and upright" or "virtual and inverted" are wrong!
EK physics #999.

One real image inverted by another converging lens to produce an upright, real image.

04-02-2012, 09:47 PM   #7
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Quote:
 Originally Posted by chiddler EK physics #999. One real image inverted by another converging lens to produce an upright, real image.
its true for a single lens image

once you include another lens it no longer applies to the FINAL image but DOES apply to the intermediate image

ex
converging lens w/ a diverging lens
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04-02-2012, 10:03 PM   #8
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Quote:
 Originally Posted by MrNeuro its true for a single lens image once you include another lens it no longer applies to the FINAL image but DOES apply to the intermediate image ex converging lens w/ a diverging lens
yeah i know this.

So lets make some generalizations:

A converging lens (object outside focal) + diverging lens ---> Inverted, virtual image. Always.
A converging lens (inside focal) + diverging ---> upright virtual

A converging (outside focal) + converging (outside focal) ---> Upright real
A converging (outside focal) + converging (inside focal) ----> i suppose this depends on how close the image is to the second lens. Right?

A converging (inside focal) + converging (outside focal) ---> depends
And converging (inside) + converging (inside) ---> virtual upright.

04-02-2012, 10:14 PM   #9
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Quote:
 Originally Posted by MrNeuro its true for a single lens image once you include another lens it no longer applies to the FINAL image but DOES apply to the intermediate image ex converging lens w/ a diverging lens
It always applies as long as you remember that the second lens effects (upright/virtual, real/inverted, etc) are relative to the second object (first image) and not the first object.

04-14-2012, 03:01 PM   #10
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Quote:
 Originally Posted by chiddler yeah i know this. So lets make some generalizations: A converging lens (object outside focal) + diverging lens ---> Inverted, virtual image. Always. A converging lens (inside focal) + diverging ---> upright virtual A converging (outside focal) + converging (outside focal) ---> Upright real A converging (outside focal) + converging (inside focal) ----> i suppose this depends on how close the image is to the second lens. Right? A converging (inside focal) + converging (outside focal) ---> depends And converging (inside) + converging (inside) ---> virtual upright.
does anybody know how i figured this out? i can't remember =/

nvm i got it :-3

Last edited by chiddler; 04-14-2012 at 03:15 PM.

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