A 500nm wave has a wave length of 500nm.
The nano- prefix means × 10^-9 → 500 nm = 500 × 10^-9 m
The centi- prefix means × 10^-2 → 1 cm = 1×10^-2 m
→ 1 cm ÷ 500 nm = (1×10^-2 m) ÷ (500×10^-9 m)
= (1/500) × 10^(-2 - -9)
= 0.002 × 10^7
= 2 × 10^4
= 20,000 waves.
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Convert everything to meters, then divide: 0.01 / 500 x 10-9 = 20,000.
50 nanometers = 0.05 micrometers
.0002 millimeters
one billion of them (1,000,000,000) (109)
1 micron is 1000 nanometers