For what distance is ray optics a good approximation when the aperture is 4 mm wide and the wavelength is 500 nm?

For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm?

For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm?

For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm ?

For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm ?

For what distance is ray optics a good approximation when the aperture is 3mm wide and the wavelength is 500 nm?

For what distance is ray optics a good approximation when the aperture is 3 mm wide and the wavelength is 500 nm ?