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## Homework Statement

How many orders of diffraction will be visible if light of wavelength 500nm fals on a grating with 600 000 lines per metre?

## Homework Equations

n = dsinѲ / λ

## The Attempt at a Solution

n = 6X10⁵m ÷ 5 X 10ˉ⁷m = 1.2

So 1 order of diffraction will be visible is this right??

I don't have the angle so I could put it into the equation.

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