Enter the wavelength of the laser (nm) and the numerical aperture into the Spatial Resolution Calculator. The calculator will evaluate the Spatial Resolution.

## Spatial Resolution Formula

The following two example problems outline the steps and information needed to calculate the Spatial Resolution.

SR = .61 * wl / NA

Variables:

- SR is the Spatial Resolution (nm)
- wl is the wavelength of the laser (nm)
- NA is the numerical aperture

To calculate the spatial resolution, multiply the wavelength by .61, then divide by the numerical aperture.

## How to Calculate Spatial Resolution?

The following steps outline how to calculate the Spatial Resolution.

- First, determine the wavelength of the laser (nm).
- Next, determine the numerical aperture.
- Next, gather the formula from above = SR = .61 * wl / NA.
- Finally, calculate the Spatial Resolution.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

wavelength of the laser (nm) = 250

numerical aperture = .9

SR = .61 * wl / NA** **= ?