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Microscope

In reference to a microscope, the minimum distance between two lines at which they are just distinct is called resolving limit (RL) and its reciprocal is called resolving power (RP).
 
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Fig. 38
 
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λ = Wavelength of light used to illuminate the object,
μ = Refractive index of the medium between object and objective,
θ = Half angle of the cone of light from the point object, μ sin θ = Numerical aperture.

Telescope

Smallest angular separations () between two distant objects, whose images are separated in the telescope is called resolving limit. So, resolving limit,113695.png and resolving power 113704.png, where a = aperture of objective.




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