Compare calculators

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

Thin Lens Focal Length Calculator

Compute the focal length of a thin lens from object and image distances, or find where an image forms for a known lens. Essential for optics lab work, camera design, and eyeglass prescription analysis.

Object Distance (cm)

Image Distance (cm)

Fill in the required fields to see your result.

Optics

Snell's Law Refraction Calculator

Calculate the refraction angle when light passes between two media using Snell's Law. Use it in optics coursework, lens design, or to find the critical angle for total internal reflection.

Incident Angle (degrees)

First Medium Refractive Index

Second Medium Refractive Index

Fill in the required fields to see your result.

Key differences

	Thin Lens Focal Length Calculator	Snell's Law Refraction Calculator
Category	Optics	Optics
Inputs required	2	3
Result	Focal Length (cm)	Refracted Angle (degrees)
What it does	Compute the focal length of a thin lens from object and image distances, or find where an image forms for a known lens. Essential for optics lab work, camera design, and eyeglass prescription analysis.	Calculate the refraction angle when light passes between two media using Snell's Law. Use it in optics coursework, lens design, or to find the critical angle for total internal reflection.