Lens Limitations

I'd like to know the reason for degraded low light performance with very short lenses, as stated in the paragraph below.

I was under the assumption that short focal lenght was not an obtacle for low light situations.

"Degraded low light performance: Very long lenses (as well as very short ones) typically capture significantly less light than normal lenses in...

*** ** **** *****."
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**** ********. *'** ***** **** **** *** ***** ***** ** the **** ******* ***.

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