# Photons projected towards corner, What next ? ( Uncertainty principle in bound region )

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There are series of events that led to the query - First what I was wondering is what happens when light falls in the "corner" of a perfect ( reflecting ) substance like the corner of a cube.

Then I was watching a video on Heisenberg's, where it said about spreading out of photons due to uncertainty as the slit is narrowed down. I wondered if it was not the opening but the whole passage is narrowed down so that the photons are not allowed to spread out, but uncertainty principle would still prevail, but how?

Thirdly, I related it with my light in corner question, there too the passage for light becomes narrower and narrower, so Heisenberg comes to play, but not allowed to spread out to "express" uncertainty in momentum. How is it going ?

Additional query - In a infinite potential well, an electron cannot tunnel. So now, I decrease the width of the tunnel ( keeping the barrier potential infinite ) to shorten the space for electron. So, again Heisenberg comes to play after a certain shortening. But again the electron is not allowed to escape the region to demonstrate uncertainty in momentum even if the width is reduced to JUST contain the electron, thus defining its position. How is these all going ? I feel I am missing something - please help me out ! So can in such circumstance the electron tunnel the infinite barrier ?

edited Feb 22, 2017

A particle can never tunnel through an infinitely high barrier, no matter how narrow it is.

That's it - read my question ! That's what I asked, how is uncertainty in momentum displayed ? Read my last paragraph carefully - the question lies in there...

Anyone ?? Anything ?? Any Ideas ?? Even if my question is somehow not correct, please specify the mistake !!!

Your contribution is too vague to know what to reply, except for the very last question, which I answered.

See, I know Uncertainty expression that comes is valid in a well, I know the calculations. MY QUESTION IS IF BY SHORTENING THE SIZE OF THE WELL, IF I MAKE IT TO THE RADIUS OF THE ELECTRON NOT LETTING IT TO MOVE ANYMORE OF IF YOU CONSIDER IT TO BE A POINT PARTICLE THEN REDUCE THE WIDTH OF WELL TO ZERO, THEN FROM WHERE THE UNCERTAINTY COME FROM ?? DOES IT COME FROM SHUTTING UP AND CALCULATING ? AND DOES THE QUESTION OF WHAT HAPPENS TO LIGHT WHEN IT IS PROJECTED INTO CORNER CAN BE ANSWERED JUST BY SHUTTING UP AND CALCULATING ??

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