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The black thing on the right is a SNAP-27 RTG. and the box on the left is an ALSEP (Apollo Lunar Surface Experiment Package) that it powers.
Here's a picture of the ALSEP for Apollo 12:
And here is Alan Bean attaching it to the RTG with the antenna to make the barbell object in your original image:
As to the second part of the question, it is clearly a ...
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Thanks to @astrosnapper's comment I've looked at section 3.2.1. of Murphy et al. 2007 APOLLO: the Apache Point Observatory Lunar Laser-ranging Operation: Instrument Description and First Detections.
APOLLO uses the Apache Point 3.5 meter telescope for both transmit and receive, a rotating transparent disk with a mirrored spot on it rotates 20 times per ...
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