Compare calculators

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

Optical Magnification Calculator

Find the total magnification of a microscope or telescope from objective and eyepiece focal lengths. Useful for students, lab technicians, and amateur astronomers configuring optical instruments.

Objective Focal Length (mm)

Eyepiece Focal Length (mm)

Tube Length (mm)

Optical System 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 Magnification Calculator	Lens Focal Length Calculator
Category	Optics	Optics
Inputs required	4	4
Result	Total Magnification (×)	Focal Length (cm)
What it does	Find the total magnification of a microscope or telescope from objective and eyepiece focal lengths. Useful for students, lab technicians, and amateur astronomers configuring optical instruments.	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.