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Both calculators run independently — change the inputs on either side to compare results.

Optical Resolution Calculator

Determines the minimum resolvable distance between two point sources through a microscope or lens using the Rayleigh criterion. Essential for microscopists, optical engineers, and anyone specifying imaging system performance.

Light Wavelength (nm)

Numerical Aperture

Immersion Medium

Objective Type

Fill in the required fields to see your result.

Optics

Lens Focal Length Calculator

Compute the focal length of any thick or thin lens from its refractive index, surface curvatures, and center thickness using the lensmaker's equation. Essential for optical designers, physics students, and DIY telescope builders.

Refractive Index of Lens Material

Radius of First Surface (cm)

Radius of Second Surface (cm)

Lens Thickness (cm)

Fill in the required fields to see your result.

Key differences

	Optical Resolution Calculator	Lens Focal Length Calculator
Category	Optics	Optics
Inputs required	4	4
Result	Lateral Resolution (nm)	Focal Length (cm)
What it does	Determines the minimum resolvable distance between two point sources through a microscope or lens using the Rayleigh criterion. Essential for microscopists, optical engineers, and anyone specifying imaging system performance.	Compute the focal length of any thick or thin lens from its refractive index, surface curvatures, and center thickness using the lensmaker's equation. Essential for optical designers, physics students, and DIY telescope builders.