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A diffraction grating has ? = 800&'()", and you measure a distance h = 0.75m between...

A diffraction grating has ? = 800&'()", and you measure a distance h = 0.75m between the two ? = 2 bright fringes created by a monochromatic green light source (? = 520nm).
A) (4 points) What is the distance ? from the slit plate to the screen?
B) (5 points) How many bright fringes will show up on the screen?
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