Micro-Nikkor AF-S 60mm f/2.8 G ED

Hello guys 
I am planning to buy a Nikon Micro lens
actually i am planning to buy Micro-Nikkor AF-S 60mm f/2.8 G ED
my question is; Is it a Dx or Fx lens?

if it is a FX lens and works on Nikon D5100, will it be a 90 mm lens ??

Thanks

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