I've been reading up on photolithography trying to understand how processors with sub-wavelength features can be made through photolithography, but I just don't get it. Can someone please help me by explaining in a conceptual way how light with a wavelength of, say, 200nm can be used to make a processor with 65nm features? Even with a large lens used to focus the light, you still can't make a point smaller than the wavelength of the light being focused, right? Thank you so much! Also, what is meant by numerical aperture in regards to a lens? Wikipedia didn't help me understand this.