Angular Resolution Calculator


Calculating the angular resolution of an optical instrument is crucial in various fields such as astronomy, microscopy, and photography. The angular resolution determines the smallest details that can be resolved by the instrument, impacting its performance and precision. This article provides a detailed guide on how to use an angular resolution calculator to accurately determine this crucial parameter.

How to Use

To use the angular resolution calculator, follow these steps:

  1. Input the diameter of the aperture (D) in millimeters.
  2. Input the wavelength of light (λ) in nanometers.
  3. Click the “Calculate” button to obtain the angular resolution result.


The formula to calculate angular resolution (θ) is given by:


  • θ = Angular resolution (in radians)
  • λ = Wavelength of light (in meters)
  • D = Diameter of the aperture (in meters)

Example Solve

Let’s say we have an optical instrument with an aperture diameter of 50 millimeters and operates with light of wavelength 500 nanometers.

Using the formula:

θ≈0.0122 radians


Q: What is angular resolution?

Angular resolution refers to the ability of an optical instrument to distinguish between two separate objects in the field of view.

Q: Why is angular resolution important?

Angular resolution determines the level of detail that can be observed or captured by an optical instrument, influencing its effectiveness in various applications such as astronomy, microscopy, and photography.

Q: How does aperture diameter affect angular resolution?

A larger aperture diameter leads to better angular resolution, allowing finer details to be resolved.

Q: What is the significance of wavelength in angular resolution?

The wavelength of light affects the diffraction pattern, thereby influencing the angular resolution of the optical system.


The angular resolution calculator simplifies the process of determining the level of detail that can be resolved by an optical instrument. By understanding and utilizing this parameter, researchers, photographers, and enthusiasts can optimize the performance of their equipment for various applications.

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