Relativistic Beaming (shooting a laser at 90 degrees from your line of motion)

1. Feb 2, 2012

khfrekek92

1. The problem statement, all variables and given/known data
A ship is traveling at a speed of .8c. When the ship is 90 degrees from the target, it shoots a laser downwards. What angle must it shoot the laser to hit the target?

2. Relevant equations
$\mu_{x}=0$
$\mu_{y}=-c$
$\mu_{x}'=$$\frac{mu_{x}-v}{1-\frac{v*mu_{x}}{c^{2}}}=-v$
$\mu_{y}'=$$\frac{mu_{y}}{1-\frac{v*mu_{x}}{c^{2}}}=-.6c$

3. The attempt at a solution
I have tried everything I can think of, but nothing seems to work..
I have gotten to this point and I'm fairly sure this far is at least right. Does anyone know where to proceed from here?