How do you get out of chamber 3?

Question

So, I'm in Test Chamber 003 of Portal 1, and am trying to get into a door, but I can't reach it. I have to go down a set of stairs and then there is no way up... How can I get up there?

Answer

Based on where you are standing in that screenshot, there should be an orange portal already in place to your right. You can only shoot blue portals so how would you get a portal on the other side so you can use the one that you can already reach?

Just shoot a blue portal to the other side and walk through the orange portal that is nearby.

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