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Formula Rayleigh Criterion (Angular Resolution) Minimum distance    Wavelength    Refractive Index    Angle

Formula
Formula: Rayleigh Criterion (Angular Resolution)

Minimum distance

Unit
Minimum distance between two still distinguishable objects. If the objects are closer than \( d_{\text{min}} \), then the objects can no longer be perceived as two objects.

With this formula you can estimate how good, for example, a telescope can distinguish two nearby objects on the moon.

Wavelength

Unit
Wavelength of light falling on the lens from the two objects under consideration.

Refractive Index

Unit
Refractive index of the medium (e.g. air) between the viewed objects and the lens.

Angle

Unit
Half opening angle on the object side.