There's no change in image scale as such, but the previews aren't quite the same since I roughly created them manually. Apologies for the inconsistency. Have a crack anyway.
As you say, it's all physics and math and science works. Trouble is, however, a lot of people just parrot information that they heard/read and apply it to situations where it no longer holds. There's some questions I had that I hadn't seen satisfactory answers to and since it's easier for a lay person like me to just do it and see the results for myself, I'm happy to do just that.
Back on topic...which is which?
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