# Special Relativity and the Light Clock and which direction was the laser pointing? [closed]

If I were to make a light clock, I would have some sort of laser pen attached to the top of one of two mirrors. That laser pen would be perpendicular to the surface of either/both mirrors. I would click a 'go' button and a beam of light would bounce between the mirrors. So far so good. Now, we introduce the very speedy observer to system. Lets say he/she gets to observe the moment I click the 'go' button. Which direction was the laser pen pointing for the observer? If perpendicular to the mirrors, why does the light beam strike the 2nd mirror at all?

## closed as unclear what you're asking by Bill N, user36790, Daniel Griscom, Gert, Sebastian RieseFeb 18 '16 at 21:46

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• What is the orientation of the mirrors with each other in the lab reference frame? – Bill N Feb 13 '16 at 23:27
• As I understand it, the light clock uses two mirrors that are parallel to each other so the light beam will bounce between the mirrors indefinitely. – S Bateman Feb 15 '16 at 3:08