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

Interference Fringe Calculator

Compute the fringe spacing in a Young's double-slit or similar two-beam interference experiment. Useful for optics labs, physics coursework, and verifying experimental setups.

Wavelength (nm)

Slit Separation (mm)

Screen Distance (mm)

Fill in the required fields to see your result.

Optics

Numerical Aperture Calculator

Calculate the numerical aperture (NA) of an optical fiber from the refractive indices of its core and cladding. NA determines light-gathering ability and the maximum acceptance angle of the fiber.

Core Refractive Index

Cladding Refractive Index

Fill in the required fields to see your result.

Key differences

	Interference Fringe Calculator	Numerical Aperture Calculator
Category	Optics	Optics
Inputs required	3	2
Result	Fringe Spacing (mm)	Numerical Aperture
What it does	Compute the fringe spacing in a Young's double-slit or similar two-beam interference experiment. Useful for optics labs, physics coursework, and verifying experimental setups.	Calculate the numerical aperture (NA) of an optical fiber from the refractive indices of its core and cladding. NA determines light-gathering ability and the maximum acceptance angle of the fiber.