Achieving Invisibility with Water Diffraction: Is it Possible?

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Discussion Overview

The discussion revolves around the concept of achieving invisibility through the use of water diffraction and other optical techniques. Participants explore theoretical and practical approaches to making objects invisible, considering both 2D and 3D implementations.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions whether it is possible to make an object invisible using water diffraction, noting that light diffracts when it hits water.
  • Another participant points out that not all light refracts, suggesting that some light will pass through the water and interact with the object, complicating the invisibility concept.
  • A different approach is proposed involving a large flat sheet of metal with cameras and projectors to create a 2D invisibility effect, though the challenge of extending this to 3D is acknowledged.
  • Another participant suggests using lightguides to create a hollow ball that could render objects inside it invisible by guiding light around them, but raises concerns about geometric limitations.
  • One participant seeks feedback on whether their proposed idea could work in 3D, indicating uncertainty about its feasibility.
  • A link to an external website is shared, which contains related information on the topic of invisibility.

Areas of Agreement / Disagreement

Participants express various ideas and approaches to the concept of invisibility, but there is no consensus on the feasibility or effectiveness of the proposed methods. Multiple competing views remain, and the discussion is unresolved.

Contextual Notes

Participants discuss the limitations of their ideas, including the challenges of achieving 3D invisibility and the geometric constraints of using lightguides.

oozie1
I am really new to this site and I'm only 15 so if this sounds unclear please forgive:

When light hits water it diffracts so i want to ask would it be possible to make something invisible between this medium of when the light hits the water and defracts.
 
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But not all the light refracts right? Remember you can see through water as well as see reflections off of it. So some light will go through the water and interact with what you trying to make invisible. I guess you could try to use steep angles to the enemy so all they see is reflected light (like a flattened boat using a sheet of water covering it to reflect light away to make it look like part of the lake or river) but that would only work in bright days and would easily be compromised by polarized sunglasses.
 
Thanks still...
.......oozie......
 
Originally posted by oozie1
I am really new to this site and I'm only 15 so if this sounds unclear please forgive:

Welcome to the PFs, oozie1! :smile:

By the way, there's no such thing as "only 15".
 
ok hows this let's say you have a large flat sheet of metal, you cover bothe sides with small cameras and projecters. the projecters at the front give out the image from the cameras on the back and vice versa, so although the object is not invisiable you technically see through it, however this only works 2d, we now need to try and make it work 3d, help?
 
Interesting question, oozie1.
My idea is, you use lightguides (fibres). You could build a hollow ball, and connect any two antipode points with a lightguide. Everything inside the ball would be invisible because the light is guided around it. But I think you get problems with the geometry - there is not enough space for the fibers to twist around each other inside the ball.
 
but would my ide work do you think, or could it have the same problem when made 3d
 

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