दूरबीन विभेदन कैलकुलेटर — सूत्र

Telescope Angular Resolution

Dawes Limit (empirical, for equal-brightness stars)

theta = 116 / D arcseconds (D in mm)

Rayleigh Criterion (diffraction-limited at 550 nm)

theta = 138 / D arcseconds

Smaller is better. A 200 mm telescope resolves about 0.58 arcsec. Atmospheric seeing typically limits ground-based resolution to about 1-2 arcsec.