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Details of the calculation: Diffraction limits the resolution according to θ = 1.22 λ/D = y/L. Specifically, this is the limit to resolution for two point-object images of near-equal intensity (FIG. Would you expect the angular resolution of a 20-meter space telescope observing visible light to be better than, equal to, or worse than 0.01 arcsecond? The imaging system's resolution can be limited either by aberration or by diffraction causing blurring of the image. your hand (~ 10 degrees), but only because it is far away. To achieve higher resolution a large aperture is needed. For instance, a telescope with an 80-mm-wide lens and a 400-mm focal length has a focal ratio of f/5. What is the angular resolution, R, for this telescope in A) degrees?B) Arc minutes? θ is the angular resolution (expressed in radians), λ is the wavelength of the light, d is the diameter of the lens aperture. The larger the telescope, the smaller R is, and the better the angular resolution is. For example, in the case of yellow light with a wavelength of 580 nm, for a resolution of 0.1 arc second, we need D=1.2 m. Reasoning: The minimum angular separation of two points which can just be resolved by an optical instrument is given by θmin = 1.22 λ/D, where D is the diameter of the aperture of the instrument. Moon 3 mm pupil 30' Moon 9 mm pupil 30' Moon telescope 30' Created Date: 8:35:29 PM. Another important formula is the lens-maker's formula: 1/f l = (n l-1) (1/R 1 + 1/R 2) Its eyepiece is a 4.00 cm focal length lens. Solved a = (2.06 x 105) Use the formula to calculate the. Assume an average light wavelength of 550 nm.