optical sound output from an iMac 5K?

Will the iMac 5K power an optical sound system? I have a Mac Pro with a superb optical sound system and I am tempted by the retina display of the 5K but I would not want to lose my surround sound while photoshopping. I hear that the optical drive is within the earphone jack but what sort of lead would it need to plug into my optical feed on the amplifier?

I believe it's a Tos-Link cable that is needed for the iMac.

http://store.apple.com/us/product/H...ink-optical-audio-cable-with-line-out-adapter

You need an optical cable, a mini TOSLINK adapter for the Mac (http://www.amazon.com/dp/B0002MQGRM/?tag=macforums0e4-20) and whatever other end goes to your amplifier.
Since we don't know what amplifier you have, we don't know what, if any, adapter you need.

Thanks guys that answers my question, and Craig as I have an optical feed from Mac Pro to the amplifier that means it is an optical feed to the amplifier, so this adaptor you pointed me too would do the job. However the question left in my mind is that optical feeds are used because of their high quality signal transmittance whereas a mini jack is low on the hierarchy of systems of signal transmittance, so I guess I would be losing quality, but that may be a question for a hi-fi forum?

It's not really a mini jack, just shaped like one so it fits the hole.
It's hollow so the laser feeds right into the glass cable. No signal degradation what so ever.

Craig, brilliant thanks for that.