noun
definition
The quality of being bright.
definition
The perceived luminance of an object.
definition
Intelligence, cleverness.
Examples of brightness in a Sentence
The brightness of every room made his sensitive eyes squint.
The brightness of the morning was magical.
The emerging brightness of the new day, while inviting, did nothing to sort out the tangle of thoughts crowding his brain like the line of a snarled fishing reel.
It was still his, a place for him to escape Ingrid and the brightness of his condo.
The sudden brightness blinded her, and she shielded her eyes.
She blinked, blinded by the brightness of the morning sun streaming into the catacombs.
Stars whose brightness fluctuates are called variable stars.
His fine eyes lit up with a thoughtful, kindly, and unaccustomed brightness, but he was looking not at his sister but over her head toward the darkness of the open doorway.
He returned to the glaring brightness of the condo.
Of course, he had not gone far when he noticed the brightness of the leaves, and he quickly guessed the cause when he saw the broken jars from which the treasure was still dropping.
He cast his eyes downward, away from the brightness, and saw little except the ground in front of him.
Red lead or triplumbic tetroxide, Pb304, is a scarlet crystalline powder of specific gravity 8.6-9.1, obtained by roasting very finely divided pure massicot or lead carbonate; the brightness of the colour depends in a great measure on the roasting.
The sun knows that you like to see the world covered with beautiful white snow and so he kept back all his brightness, and let the little crystals form in the sky.
I hope your Christmas Day will be a very happy one and that the New Year will be full of brightness and joy for you and every one.
Of course, he soon noticed the brightness of the leaves, and discovered the cause, too, when he caught sight of the broken jars and vases from which the melted treasure was still dropping.
Such a brightness on the face like the light of heaven, and from the blessed Mother's cheek it drops and drops....
There, standing silhouetted in the brightness behind him stood the pride of the FBI, Jonathan Winston.
Let us now consider the distribution of brightness in the image of a double line whose components are of equal strength, and at such an angular interval that the central line in the image of one coincides with the first zero of brightness in the image of the other.
If the angular interval between the components of a double line be half as great again as that supposed in the figure, the brightness midway between is 1802 as against 1.0450 at the central lines of each image.
But, as will be evident, the bright bands bordering the central band are now not inferior to it in brightness; in fact, a band similar to the central band is reproduced an indefinite number of times, so long as there is no sensible discrepancy of phase in the secondary waves proceeding from the various parts of the same slit.
If we now suppose half the grating cut away, so as to leave 1000 lines in half an inch, the dispersion will not be altered, while the brightness and resolving power are halved.
The brightness (corresponding to B) midway between the two central points AA' is 8106 of the brightness at the central points themselves.
They emerged into the morning sun, and Xander shielded his delicate eyes from the brightness.
Perhaps the best data for a comparison are those afforded by the varying brightness of stars at different altitudes.
In the Avesta, after the separation of the Iranian stock from the Hindu and the rise of Zoroastrianism, which elevated Ormazd to the summit of the Persian theological system, his role was more distinct, though less important; between Ormazd, who reigned in eternal brightness, and Ahriman, whose realm was eternal darkness, he occupied an intermediate position as the greatest of the yazatas, beings created by Ormazd to aid in the destruction of evil and the administration of the world.
Such a conclusion would be in the face of the principle of energy, which teaches plainly that the retardation in question leaves the aggregate brightness unaltered.
But its brightness was far from comparing with the glorious accounts of its former apparitions.
At Jan Mayen (8) in 1882-1883 a scale was employed running from 1, taken as corresponding to the brightness of the milky way, to 4, corresponding to full moonlight.
She blinked back the flood of brightness and covered her eyes as she slumped back on the sofa.
He jumped to his feet flipping light switches and stumbling through both rooms, barely seeing still-sleeping Cynthia through eyes pinched nearly closed against the intrusive brightness.
He retreated toward the bathroom just as the door opened—and just as Dean hit the light switch and rolled to the floor, flooding the room in brightness.
She made her way back and circled the screaming pillar, shielding her eyes against its brightness.
When light proceeding from a small source falls upon an opaque object, a shadow is cast upon a screen situated behind the obstacle, and this shadow is found to be bordered by alternations of brightness and darkness, known as " diffraction bands."
An interesting exception to the general rule that full brightness requires the existence of the first zone occurs when the obstacle assumes the form of a small circular disk parallel to the plane of the incident waves.
Within the rectangle formed by pairs of consecutive dark lines, and not far from its centre, the brightness rises to a maximum; but these subsequent maxima are in all cases much inferior to the brightness at the centre of the entire pattern (=o, n =o).
If the aperture be increased, not only is the total brightness over the focal plane increased with it, but there is also a concentration of the diffraction pattern.
So long as there is no sensible discrepancy of phase there can be no sensible diminution of brightness as compared with that to be found at the focal point itself.
We may compare the brightness with that in the direction 0=0.
The greatest brightness is at the centre, where dC = 27rp d p, C = 7rR2.
The subsequent revivals of brightness forming the bright rings are necessarily of inferior brilliancy as compared with the central disk.
If appears that the maximum brightness in the first ring is only about 5 1 1 of the brightness at the centre.
The mean brightness varies as z3 (or as r3), and the integral found by multiplying it by zdz and integrating between o and co converges.
It may be instructive to contrast this with the case of an infinitely narrow annular aperture, where the brightness is proportional to Jo 2 (z).
The mean brightness varies as .51; and the integral f J02(z)zdz is not convergent.
The visibility of a star is a question of brightness simply, and has nothing to do with resolving power.
The light stopped by the opaque parts of the grating, together with that distributed in the central image and lateral spectra, ought to make up the brightness that would be found in the central image, were all the apertures transparent.
Babinet, the brightness of a lateral spectrum is not affected by an interchange of the transparent and opaque parts of the grating.
This was first suggested by Thomas Young, who showed that the rays producing the bows consisted of two systems, which, although emerging in parallel directions, traversed different paths in the drop. Destructive interference between these superposed rays will therefore occur, and, instead of a continuous maximum illumination in the direction of minimum deviation, we should expect to find alternations of brightness and darkness.
The brightness of the image is sometimes in creased by silvering the glass; and on removing a small portion of the silver the observer can Object see the image with part of the pupil while he sees the paper through the unsilvered aperture with the remaining part.
The disk 32 operates the wire gauze screens for equalizing the brightness of the two stars under observation.