please can you help

From: John Francis (
Date: Mon Apr 23 2001 - 08:47:17 PDT

Dear discussion group,

I am doing a piec of research into defraction gratings.

In a graph plotting sin pheta and the order of light (y-axis and x-axis respectively), what does the area under the line (if it is a straight line) represent.

Please can some reply to this address:

Thank you very much for your help and I really hope someone can help me

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