The angle between two just-resolvable points of light for a 2. 75 mm diameter pupil in radians, assuming an average wavelength of 550 nm will be 2.44 * [tex]10^{-4}[/tex] radian
The limit of resolution (or resolving power) is a measure of the ability of the objective lens to separate in the image adjacent details that are present in the object. It is the distance between two points in the object that are just resolved in the image.
Resolving power is the capacity of an instrument to resolve two points which are close together.
theta = 1.22 * ( lambda / diameter )
= 1.22 * ( 550 * [tex]10^{-9}[/tex] / 2.75 * [tex]10^{-3}[/tex] )
= 244 * [tex]10^{-6}[/tex]
= 2.44 * [tex]10^{-4}[/tex] radian
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