More typical industrial lenses would have deviations no larger than a quarter wavelength (λ/4).

The bottom half of the ring is three quarter wavelengths in length.

This is only correct for omnidirectional aerials with a length of a quarter wavelength or shorter.

A 900 MHz antenna may be three inches long for a quarter wavelength.

In the case of the fundamental first mode, it is a quarter wavelength.

The effect is most striking when a continental shelf is about a quarter wavelength wide.

By measuring amplitude to a quarter wavelength, it is possible to improve the resolution down to about 8 mm.

The J-pole is somewhat sensitive to surrounding metal objects, and should have at least a quarter wavelength of free space around it.

From the nodal point to the top of a loop is a quarter wavelength.

In the case of a mirror at normal incidence, the layers have a thickness of a quarter wavelength.