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

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.

Optics

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.

Key differences

	Snell's Law Calculator	Focal Length Calculator
Category	Optics	Optics
Inputs required	3	2
Result	Refracted Angle (°)	Focal Length (cm)
What it does	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.	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.