This cookie is set by GDPR Cookie Consent plugin. 0000253515 00000 n The SI unit for angular size is square radians, which are called steradians. If you have 20/20 vision, your visual acuity Angular resolution or spatial resolution describes the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution. Because of diffraction even an aberration-free optical system images a point source not as a point but as an Airy pattern, whose central area is called the Airy disk. As a result, the VLTI has yielded countless discoveries and technological breakthroughs. 0 0 m m is used. [3] Modern image processing techniques including deconvolution of the point spread function allow resolution of binaries with even less angular separation. window.jQuery || document.write('