An imaginary new HD video system (called Purple - Ray) has been launched and the laser it uses to read the disks has a wavelength of 400 nm (4 * 10 ^ -9 m). The lens used has a numerical appature of 1.5. What is the minimum size the markings on the disk (that represent the data) could have and still be resolved by the laser?
Note: numerical aperture is a dimensionless quantity, hence the lack of a unit.
its not .002 meters is it?
sorry, I don't have much experience with optics..