I forgot OR I have forgotten

0When should I use "I forgot" and "I have forgotten"?02br
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00CONTEXT: My friend wants me to show him some photos. I leave them at home. Later, I meet my friend and he asks: "Do you have the photos on you?"02br
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00My reply would be:02br
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00"I forgot." --- I use this in all real life situations.02br
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00But I've just invented this:02br
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00a) "I forgot." ------ If I already knew I had forgotten them. (Something like "Hope he won't meet me, I don't have the photos on me. Oops, here he comes.")02br
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00b) "I've forgotten." ----- meaning: I've just found out.02br
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00Is the above assumption correct? I don't think so. Is there any context in which you can use 01b00I've forgotten02b00?02br
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00Thank you in advance.02br
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00PS Additional questions:02br
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001) In the above context, can my friend say "Do you 01b00happen to02b00 have the photos on you?" ? Would it be more polite?02br
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002) Can I say "Is there any context 01b00under02b00 which...?" Is there any difference in the meaning betwen 01b00in/under this context02b00?0-