11. The sine of this maximum angle is the numerical aperture ( NA ) of the fiber. 12. State of the art objectives can have a numerical aperture of up to 0.95. 13. The resolution limit forumula used is 0.6 * wavelength / ( numerical aperture ). 14. In this method, multiple spatially modulated illumination patterns are used to double the effective numerical aperture . 15. Also termed immersion lithography, this enables the use of optics with numerical apertures exceeding 1.0. 16. This ratio is related to the image-space numerical aperture when the lens is focused at infinity. 17. Based on the diagram at the right, the image-space numerical aperture of the lens is: 18. Manufacturers have also introduced ever larger and more expensive lenses as a means of increasing the numerical aperture . 19. Beyond 7 nm, EUV would require a higher numerical aperture ( NA ) or else a shorter wavelength. 20. In conventional microscopes the limit is determined by the used wavelength and the numerical aperture of the optical system.
