There are 1000 nanometres (nm) in 1 micrometre (μm), so 40 μm is 40 000 nm.
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50 nanometers = 0.05 micrometers
1.000 micrometers = 1,000 nanometers 0.600 micrometer = 600 nanometers
200 nanometers=0.2 micrometers
4000 micrometers = 4'000'000 nanometers
1 nanometer = 0.001 micrometers So 900