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A red laser light (675nm) and green laser light (570nm) are both sent into a Young's...

A red laser light (675nm) and green laser light (570nm) are both sent into a Young's double slit apparatus at the same time. The slits are separated by .170mm and the viewing screen is 237cm away.  

By how much are the third red bright spot above the center line and the third green bright spot above the center line separated?

___ cm

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