convex lens


  • WordNet 3.6
    • n convex lens lens such that a beam of light passing through it is brought to a point or focus
    • ***


In literature:

If parallel rays of light fall upon a double-convex lens, D D, Fig.
"American Handbook of the Daguerrotype" by Samuel D. Humphrey
The convex lens found at Nimroud shows that they were not unacquainted with magnifying instruments.
"History of the Conflict Between Religion and Science" by John William Draper
By means of a convex lens it may be focused on the retina without accommodation (dotted lines).
"A Practical Physiology" by Albert F. Blaisdell
C is a frame for holding the negative, on the opposite side of which is a double convex lens facing the light.
"Scientific American Supplement, No. 586, March 26, 1887" by Various
The convex lens of the eye-piece was carried not by a tube properly so called, but by four rigid fine wires placed at right angles.
"Biographies of Distinguished Scientific Men" by Francois Arago
A double convex lens three feet in diameter is worth $60,000.
"Pushing to the Front" by Orison Swett Marden
Lenticular: round, doubly convex; like a lens or lentil.
"Explanation of Terms Used in Entomology" by John. B. Smith
The convex lens is placed in the more outward position in the telescope, i.e.
"On Laboratory Arts" by Richard Threlfall
D'Acquapendentus' bottle has given way to the convex lens, and to concave, spherical, and parabolic mirrors, etc.
"Scientific American Supplement, No. 488, May 9, 1885" by Various
The convex lens is that used to correct farsightedness.
"The Home Medical Library, Volume II (of VI)" by Various
A convex lens brings light to a focus, and it also brings radiant heat to a focus.
"Common Science" by Carleton W. Washburne
The crystalline lens is of different degrees of convexity on its two sides.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
In the centre of one of these sides is fixed a lens, double convex, of at least three inches and a half diameter.
"Endless Amusement" by Unknown
The concentration into a focus is obtained through a perfectly-shaped, convex lens.
"Chapters of Bible Study" by Herman J. Heuser
The bands should be observed with a convex lens, of about 8 in.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 6" by Various
In the construction of reflecting telescopes, concave mirrors, or specula, are combined with a double convex lens.
"Popular Technology; Volume 2" by Edward Hazen
It is a simple matter to counteract the effects of undue convexity by means of a concave lens.
"Curiosities of Light and Sight" by Shelford Bidwell
When will a convex lens produce a virtual image?
"Physics" by Willis Eugene Tower
This may be done either by a convex lens, or by a concave mirror.
"Letters on Astronomy" by Denison Olmsted
The cor'nea shields the CRYSTALLINE LENS, and is more or less convex according to the lens which it covers.
"A Guide to the Scientific Knowledge of Things Familiar" by Ebenezer Cobham Brewer

In poetry:

My aunt! my poor deluded aunt! Her hair is almost gray;
Why will she train that winter curl
In such a spring-like way? How can she lay her glasses down,
And say she reads as well,
When through a double convex lens
She just makes out to spell?
"My Aunt" by Oliver Wendell Holmes

In news:

Having the shape of a double-convex lens.
A simple magnifying glass with a convex lens.

In science:

This problem could be solved with the telescope invented by Kepler in 1611 in which a convex lens is used at the eye, instead of the concave lens in Galilei's telescope. The convex eye-lens is placed with its focus where the star images are formed by the front lens.
Astrometry during the past 2000 years
Reflected by convex lens surfaces, this light causes ghosting as well as diffuse and structured contamination in the flat-fields.
Improved Photometric Calibration of the SNLS and the SDSS Supernova Surveys
Figure 3. design, meridional ray intercept curves and rms spot sizes for (a) plano-convex lens, (b) cemented doublet lens, (c) four lens system.
Testing and design of a lens system for atom trapping and fluorescence detection
The first element after the entrance window is a plano-convex lens of 100mm focal length that collimate the beam for the gating unit and it images the telescope pupil, placed 15.1m before the lens, on the steering mirror surface.
Design of the wavefront sensor unit of ARGOS, the LBT laser guide star system
The first WFS element with optical power is a commercial plano-convex lens of 100mm focal length.
Design of the wavefront sensor unit of ARGOS, the LBT laser guide star system
Even curved lens surfaces occasionally produce ‘halation’ around point source images which may require experimenting with both bi-convex and plano-convex lenses when designing a focal reducer.
Classical Spectroscopy
Consider that a region of positive spatial curvature is like a convex gravitational lens, tending to focus light rays, acting as if it had a positive matter density which attracted the rays.
On the energy of homogeneous cosmologies