Wavelength is defined as the difference between two successive crust or trough. It is denoted by λ.
Wavelength is nothing but length of a full cycle of a wave from one point to the next same point.
Finding Wavelength
Wavelength formula for any wave given by
These are the wavelengths in electromagnetic spectrum.
Subwavelength
A subwavelength-diameter optical fibre (SDF or SDOF) is an optical fibre whose diameter is less than the wavelength of the light being propagated through it.
An SDF usually consists of long thick parts (same as conventional optical fibres) at both ends. A subwavelength-diameter fibre wraps light around human hair.
Angular wavelength
A quantity related to the wavelength is the angular wavelength (also known as reduced wavelength), usually symbolized by ƛ (lambda-bar).
It is equal to the "regular" wavelength "reduced" by a factor of 2π (ƛ = λ/2π).
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