Compare calculators

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

Prism Dispersion Calculator

Calculate the deviation angle of light passing through a prism given its apex angle, incident angle, and refractive index. Useful for designing spectrometers, understanding chromatic dispersion, and optics coursework.

Prism Apex Angle (degrees)

Incident Angle (degrees)

Prism Material

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

	Prism Dispersion Calculator	Lens Focal Length Calculator
Category	Optics	Optics
Inputs required	3	4
Result	Deviation Angle (degrees)	Focal Length (cm)
What it does	Calculate the deviation angle of light passing through a prism given its apex angle, incident angle, and refractive index. Useful for designing spectrometers, understanding chromatic dispersion, and optics coursework.	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.