A bright star is indicated to have a brightness magnitude of – 5 compared to a star of brightness zero magnitude. It means that this star compared to the reference star of zero brightness is
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Given that magnitude for brightest star = – 5
and magnitude of given star = 0
Now m 2 – m 1 = 0 – (– 5) = 5
The brightness ratio is given by
So bright star is 100 time bright that the dim star.
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