Private flute lessons

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• "Less than 10% chance she is really invisible"

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  • • 5/5 stars
  • MommmieD
  • Lynnwood, WA

  Review of Christina Sjoquist, August 22, 2008

  According to the laws of physics, a perfectly invisible person would necessarily be blind, no matter how their invisibility were achieved. In order to see light, it must be absorbed by the retina, but in order for a person to be invisible, the body must not absorb light. So to retain sight at least pupil sized holes in the cloak would be necessary in front of the pupils and directly behind them on the back of the person as light isn't being transmitted through. In fact, according to the no cloning theorem of quantum mechanics, they could not even make a copy of the photons so they could see one copy and allow the other copy to pass through or around them. This idea was first discussed by Mat Ryer a computer software engineer based in London.

  This physical barrier appears to offset the advantage of any perfect invisibility method, unless one's intent was simply to hide and be still, letting the danger pass. On the other hand, a practical invisibility method need not allow light of all frequencies to pass all the time, so there may be ways around this limitation. For example, if the wearer of a perfect invisibility device had goggles that allowed him or her to perceive infrared light while the invisibility device only diverted visible light, the wearer would be effectively invisible to the human eye while still being able to see heat sources.

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  According to the laws of physics, a perfectly invisible person would necessarily be blind, no matter how their invisibility were achieved. In order to see light, it must be absorbed by the retina, but in order for a person to be invisible, the body must not absorb light. So to retain sight at least pupil sized holes in the cloak would be necessary in front of the pupils and directly behind them...

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