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

Focal Length Calculator

Find the focal length of a lens given the distance to the object and the distance to the formed image. Essential for photographers, opticians, and physics students working with thin-lens optics.

Object Distance (cm)

Image Distance (cm)

Fill in the required fields to see your result.

Optics

Snell's Law Calculator

Determine the refraction angle when light passes between two media of different refractive indices using Snell's Law. Useful in optics coursework, lens design, and understanding phenomena like rainbows and fiber optics.

Refractive Index 1

Incident Angle (°)

Refractive Index 2

Fill in the required fields to see your result.

Key differences

	Focal Length Calculator	Snell's Law Calculator
Category	Optics	Optics
Inputs required	2	3
Result	Focal Length (cm)	Refracted Angle (°)
What it does	Find the focal length of a lens given the distance to the object and the distance to the formed image. Essential for photographers, opticians, and physics students working with thin-lens optics.	Determine the refraction angle when light passes between two media of different refractive indices using Snell's Law. Useful in optics coursework, lens design, and understanding phenomena like rainbows and fiber optics.