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## Homework Statement

At what angle will 750nm light produce a second minimum if the single-slit width is 2.0um

## Homework Equations

Sin(theta)=n(lambda)/w

## The Attempt at a Solution

This is what I got so far

(theta)=sin-1(3x10^-6/2x10^-6)

I dont understand why I keep getting error on my calculator, what am I doing wrong here please help