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How can we measure the wavelength of light?

Answer 1

I would use Young's Double Slit Experiment (1801).

This is one of the classical experiments in Optics and I think it was used by Young to evaluate the wavelength #lambda# of Sun light.
Here it is a diagram of the set up:

on the screen you will detect a series of bright and dark frinjes whose positions, #y#, can help you to evaluate the wavelength (#m# is the order, zero for the central maximum and #1, 2, 3,...# for the other maxima above or below the central maximum).

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Answer 2

Luke Allen

The wavelength of light can be measured using techniques such as diffraction grating, interferometry, or spectrophotometry. These methods involve observing patterns of light interference or analyzing the absorption or emission spectra of light to determine its wavelength.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.