The phrase "a diverging lens" is correct and usable in written English.
It can be used in contexts related to optics, physics, or discussions about lenses and their properties.
Example: "In optics, a diverging lens is used to spread out light rays that are initially parallel."
Alternatives: "a concave lens" or "a negative lens".
For intensity images, a diverging lens was used to increase the diameter of the laser spot on the sample to 30 μm.
In order to evaluate the large scale optical quality of the sample, we added a diverging lens into the beam of the excitation laser in the μPL setup.
In brief, the cortex was illuminated with a laser diode (Sanyo DL7140-201, 785 nm, 70 mW, SANYO Electric, Tokyo, Japan) via a diverging lens and scattered light was assessed by a CCD camera (CT150A, CTec Photonics, Modesto, CA, USA).
In fact: D = 1/4 = +0,25 Place the sign "+" before the power of a converging lens and the sign "-" before the power of a diverging lens.
Intensity images were obtained using a diverging lens in order to increase the diameter of the laser spot on the sample to 30 μm and by measuring within the spectral range of 875 1000 nm using a high-pass filter in order to cut off the emission from the wetting layer and the substrate.
Light from a monochromatic point source is expanded by a diverging lens (not shown), then is collimated into a parallel beam.
This temperature gradient produces a refractive index gradient which behaves like a converging or diverging lens depending on whether the change rate of refractive index with respect to temperature, ( {{{text{d}}n} mathord{left/ {vphantom {{{text{d}}n} {{text{d}}T}}} right. kern-0pt} {{text{d}}T}} ), is positive or negative [20, 21].
One simple design consists of two fixed convex (converging) lenses of unequal power with a movable concave (diverging) lens between them.
Due to the Gaussian profile of the excitation laser, the temperature gradient produces a refractive index gradient which is maximum at the beam center and behaves like a converging or diverging lens depending on whether dn/dT is positive or negative, respectively (Georges [1994]; Snook and Lowe [1995]).
For diverging lenses, use a negative focal length value.
(Right) Refraction of light by converging and diverging lenses, showing the principal axis, the principal focus (or focal point) F, the focal length f, and the focal plane.
