for a circle of radius r is ‘1 rad’ the angle corresponding to length r on the circle,
say
accordingly :
:
for a circle of radius r is ‘1 rad’ the angle corresponding to length r on the circle,
say
accordingly :
:
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The diameter of the smallest disk that a lens can produce as image of a point size object is called Airy-disk
According to the so called “Rayleigh Criterion” holds:
See F-number