* Know the conversion: 1 micrometer (µm) = 1000 nanometers (nm)

* Set up the conversion:

424 nm * (1 µm / 1000 nm)

* Cancel out the units:

424 * (1 µm / 1000)

* Calculate:

424 / 1000 = 0.424 µm

Therefore, there are 0.424 micrometers in 424 nanometers.