negative lens

To counteract the effect of the negative lens, the positive lens has to be thicker.

Chameleon eyes feature a negative lens, meaning that the lens is concave.

You can view the future through the negative lens of fear or through the positive lens of opportunity.

In contrast to the Fraunhofer doublet, it has a negative lens first followed by a positive lens.

Unique features of chameleon vision include a negative lens, a positive cornea, and monocular focusing.

They also use a curved secondary mirror to relay the image that extends the light cone the same way the negative lens telephoto group does.

Negative lens or "Galilean"

The simple negative lens placed before the focus of the objective has the advantage of presenting an erect image but with limited magnification.

Negative lenses, uses to describe diverging optics, see lens (optics)

A negative lens, usually a Barlow or a photographic teleconverter, is placed in the light cone before the focal plane of the telescope objective.

The combination of a negative lens and a positive cornea in the chameleon eye allow for accurate focusing by corneal accommodation.

They consist of a single element refractor objective combined with a silver backed negative lens (similar to a Mangin mirror).

When a plane wavefront illuminates a negative lens, it is expanded into a wave which appears to diverge from the focal point of the lens.

Positive lenses cause light rays to converge and negative lenses cause light rays to diverge.

The negative lens is usually full diameter and placed at the entrance pupil of the telescope (commonly called a "corrector plate" or "meniscus corrector shell").

While the negative lens L moves from the front to the back of the lens, the lens L moves forward and then backward in a parabolic arc.

Inverting the telephoto configuration, employing one or more negative lens groups in front of a positive lens group, creates a wide-angle lens with an increased back focal distance.

In science textbooks, positive lenses are usually diagrammed as convex on both sides; negative lenses are usually diagrammed as concave on both sides.

The instrument often includes a weak negative lens, creating a virtual image of the scene at about the same distance as the drawing surface, so that both can be viewed in good focus simultaneously.

Maksutov based his design on the idea behind the Schmidt camera of using the spherical errors of a negative lens to correct the opposite errors in a spherical primary mirror.

To the Editor: I was surprised that you chose to interpret Oprah Winfrey's decision to stop endorsing books through a negative lens ("Oprah Demurs," editorial, April 10).

When the plane wave is incident at a non-normal angle, the pattern formed is more complex but still acts as a negative lens provided it is illuminated at the original angle.

The spherical aberration normally produced by the simple spherical mirror surface is canceled out by the opposite spherical aberration produced by the light traveling through the negative lens.

These designs called catadioptric, 'reflex', or 'mirror' lenses have a curved mirror as the primary objective with some form of negative lens in front of the mirror to correct optical aberrations.

Maksutov seems to have picked up the idea again in 1941 war-torn Europe as a variation on an earlier design that paired a spherical mirror with a negative lens, Bernhard Schmidt's 1931 "Schmidt Camera".