Question

Light of wavelength 469 nm passes through a slit, creating a diffraction pattern on a screen. The angular separation between the first diffraction minima on either side of the central maximum is 6.0∘
. Determine the width of the slit.

I used this equation to solve for the question
aSin(theta)=(m)(lamda). Which give me 4.49mircrons, but that's not the answer
Θ may be 3º ... the wording is ???
the theta should be 3.0 not 6.0 degree since it said on either side

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