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InvisibleBodhi of Ankou
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How does the zoom on binoculars work?
    #23399521 - 06/30/16 11:42 PM (7 years, 6 months ago)

I know light travels in straight lines but how do you draw things into focus, and when it gets all blurry whats actually happening? Am I seeing stretched out wavelengths of light or what?


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InvisibleI_was_the_walrus
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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399530 - 06/30/16 11:45 PM (7 years, 6 months ago)



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InvisibleBodhi of Ankou
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Re: How does the zoom on binoculars work? [Re: I_was_the_walrus]
    #23399534 - 06/30/16 11:47 PM (7 years, 6 months ago)

But what happens to the particles of light as it passes through the lens? Why can you focus on something far away and something close is completely blurry and out of focus? Is the particle actually being spread out and "smeared"? Because if theyre just points of weightless matter that doesnt make sense. You think you would just see more detail.


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InvisibleBodhi of Ankou
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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399535 - 06/30/16 11:48 PM (7 years, 6 months ago)

Life is cool

*twiddles with binoculars*


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InvisibleI_was_the_walrus
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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399550 - 06/30/16 11:56 PM (7 years, 6 months ago)

Well my field is chemistry, not physics. I do remember a bit from optics though. Light will slow while passing through a solid like a lens, then leave the lens at the speed of light (think of a traffic jam). How much so depends on its refractive index. Why things appear in focus and blurry at different lengths depends on the focal length of the lens. It works the same with your eye. If you look at something in the distance or up close, things at another distance will appear out of focus. Your binoculars have these lenses. By turning them, youre adjusting the distance they are from your eyes, thus adjusting the focal point.


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InvisibleBodhi of Ankou
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Re: How does the zoom on binoculars work? [Re: I_was_the_walrus]
    #23399557 - 07/01/16 12:00 AM (7 years, 6 months ago)

So its essentially adjusting the aiming point of the focal convergence?

That would mean when its blurry you're just catching the edge's of the light. A partial impression, if you will. Because you're not really looking at it, you're just catching the ripples of its intersection with the center of focus.  Which makes it blurry.

EDIT: Which touches on its wave-particle duality. Something beyond explanation.


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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399568 - 07/01/16 12:06 AM (7 years, 6 months ago)

Yeah, pretty much. Its really a function of geometry. Light leaves the lens at an angle which depends on where it entered the lens (also how concave/convex the lens is). Blurry images are just outside of the center of convergence.


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InvisibleBodhi of Ankou
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Re: How does the zoom on binoculars work? [Re: I_was_the_walrus]
    #23399572 - 07/01/16 12:08 AM (7 years, 6 months ago)

Man I love pondering shit like this, it makes you think! :highfive:


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InvisibleI_was_the_walrus
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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399575 - 07/01/16 12:09 AM (7 years, 6 months ago)

Quote:

Which touches on its wave-particle duality. Something beyond explanation.




Well kinda. The wave-particle duality is actually very well understood. Google the photoelectric effect. Optics arent really a function of wave-particle interaction. It deals more with geometry and reflection/refraction.


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Re: How does the zoom on binoculars work? [Re: I_was_the_walrus]
    #23399583 - 07/01/16 12:14 AM (7 years, 6 months ago)

Scratch that, Im thinking of something else. Wave/particle duality experiments are a function of optics, but not in the case of lenses. Its still geometry kinda stuff.


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InvisibleBodhi of Ankou
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Re: How does the zoom on binoculars work? [Re: I_was_the_walrus]
    #23399588 - 07/01/16 12:19 AM (7 years, 6 months ago)

Ok I think I get it. If you place your focus here----X when the only objects are farther away like this ------------X only a limited number of those photons are actually being captured right?

EDIT: Theres two points of convergence. The eye and the object. The lens acts as an interface for the light and bends it into convergence for the observer.

So something wide like this
|
|
|
|

Is bent into a single point like this .

Which is our perception of it.


Edited by Bodhi of Ankou (07/01/16 12:30 AM)


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InvisibleBodhi of Ankou
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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399595 - 07/01/16 12:25 AM (7 years, 6 months ago)

Watch us form a theory of light on the shroomery :lol:


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InvisibleI_was_the_walrus
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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399611 - 07/01/16 12:33 AM (7 years, 6 months ago)

Quote:

Bodhi of Ankou said:
Ok I think I get it. If you place your focus here----X when the only objects are farther away like this ------------X only a limited number of those photons are actually being captured right?

EDIT: Theres two points of convergence. The eye and the object. The lens acts as an interface for the light and bends it into convergence for the observer.




Ya. The eye also acts as a lens. Its not that youre missing out on photons, its just that they arent converging in your eye equally.


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InvisibleBodhi of Ankou
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Re: How does the zoom on binoculars work? [Re: I_was_the_walrus]
    #23399612 - 07/01/16 12:34 AM (7 years, 6 months ago)

You say equality but Im kind of puzzled by this terminology. Is there a band per photon that I need to find the center of?


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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399629 - 07/01/16 12:41 AM (7 years, 6 months ago)

No but there is a point of focus for each object at different distances from the lens.


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Re: How does the zoom on binoculars work? [Re: I_was_the_walrus]
    #23399657 - 07/01/16 12:55 AM (7 years, 6 months ago)

Quote:

Is there a band per photon that I need to find the center of?




Well...kinda. Not a "band" in the sense of wavelength or anything in this case. More like trajectory and angle of refraction along with distance from the lens. Photons are passing through the lens from everything in your field of vision. Everything at every distance. The photons that hit your "sweet spot" in the eye are controlled by the lens which you can adjust. Photons from everything else are still passing through the lens, but because they are at a different distance they dont hit your sweet spot.


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OnlineLogicaL ChaosM
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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399750 - 07/01/16 01:53 AM (7 years, 6 months ago)

Quote:

Bodhi of Ankou said:
So its essentially adjusting the aiming point of the focal convergence?

That would mean when its blurry you're just catching the edge's of the light. A partial impression, if you will. Because you're not really looking at it, you're just catching the ripples of its intersection with the center of focus.  Which makes it blurry.

EDIT: Which touches on its wave-particle duality. Something beyond explanation.




Its bascially like how a magnifying glass works: when u focus the light to a small spot, it glows hot and can burn leaves because it focuses a large area of light into a small area on the ground.

Same as binoculars and your eyes.


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InvisibleBodhi of Ankou
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Re: How does the zoom on binoculars work? [Re: LogicaL Chaos]
    #23399755 - 07/01/16 01:58 AM (7 years, 6 months ago)

Thats not really an accurate description of whats happening though, whats being focused for one, and how does this occur for another. I find humans all to commonly drop the matter once they feel they've clothed it in language, yet all too often true understanding eludes the people that drop this "knowledge"


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Re: How does the zoom on binoculars work? [Re: Bodhi of Ankou]
    #23399762 - 07/01/16 02:02 AM (7 years, 6 months ago)

U did just drop some knowledge, and now i must google-research the subject....


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InvisibleBodhi of Ankou
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Re: How does the zoom on binoculars work? [Re: LogicaL Chaos]
    #23399765 - 07/01/16 02:03 AM (7 years, 6 months ago)

Its such a deceptively simple thing, and people try to brush it off as angles and geometry, but the true reality is much more complex than that. I dont even feel I understand it yet. Theres a dimension in there that I cant quite comprehend.


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