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## Homework Statement

A single slit of width 1.50 * 10

^{-6}m is illuminated with light of wavelength 500.0 nm. Find the angular width of the central maximum.

## Homework Equations

θ = λ / b

## The Attempt at a Solution

b = 1.50 * 10

^{-6}m

λ = 5.000 * 10

^{-7}

θ = λ / b = 0.333 = 19.1°

But the answer is 38.9°.

All my calculation of diffraction on single slit is off-target. It seems there is a fundamental point that I am missing. Please help.