# Answer to Question #4223 in Optics for misha

Question #4223

You can calculate how far the moon is away ( assuming yu set your laser to stun , so yu dont blow up the moon ) the speed of light is 3 x 10

^{8}m/s . When the moon is at apogee , the laser would take 2.7 seconds for it to leave earth , reflect off the moon , and return back to earth. knowing this , calculate the distance to the moon. ( hint* - your answer should be in meters )Expert's answer

We are given:

Speed of light

Time for light to leave earth, reflect off the moon,and return back to earth:

So light traveleddistance from Erath to Moon twice ( to Moon and back to Earth)<br/>Distance isvelocity multiplied by time so:

2*L=c*t

Speed of light

*c=3***10**8**m**s*Time for light to leave earth, reflect off the moon,and return back to earth:

*t=2.7 s*So light traveleddistance from Erath to Moon twice ( to Moon and back to Earth)<br/>Distance isvelocity multiplied by time so:

2*L=c*t

__Answer:__*4.05***10**8**m*
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