Electricity - Half wave rectifier

Homework Statement

A half wave rectifier is supplying a load current of 100 mA. The input frequency is 60 Hz. Find the capacitor value required to limit the ripple ot 160 mVpp.

Really... I can solve this I'm sure... But I'm wondering what formula I need to use... I've never been shown one in class, and I don't have a textbook, so a little help with a formula would be nice...

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its V = IR

I think the equation you're looking for is $$V_r=I_{dc}/fC$$.