When a ray of light hits the boundary between two transparent materials, it is divided into a reflected and a refracted ray.

It is also possible to produce polarised light rays using a combination of reflection and refraction: When a refracted ray and the reflected ray form a right angle, the reflected ray has the property of " plane polarization ".

When a beam of white light passes from air into a material having an index of refraction that varies with frequency, a phenomenon known as dispersion occurs, in which different coloured components of the white light are refracted at different angles, i. e., they bend by different amounts at the interface, so that they become separated.

When a light beam crosses a boundary between materials with different kinds of refractive indices, the light beam will be partially refracted at the boundary surface, and partially reflected.

When the human eye is in direct contact with water as opposed to air, its normal environment, light entering the eye is refracted by a different angle and the eye is unable to focus the light.

When in use, a beam of light enters face AB, is refracted and undergoes total internal reflection from face BC, and is refracted again on exiting face AC.

It is also possible to produce polarized light rays using a combination of reflection and refraction: When a refracted ray and the reflected ray form a right angle, the reflected ray has the property of " plane polarization ".

When the beam passes from a higher to lower refractive index it tends to get bent or refracted away from the normal at the boundary according to Snell's Law.

When natural light strikes Blue Amber on a white surface, the light particles pass right through, and then are refracted off the white surface.

When I asked him what, if anything, I could do about it, he surprised me by referring me to the director of the hall.

When they reached their neighbor's house, Pamela said a few polite words to Grace and kissed Melissa lightly on the forehead, the impulse prompted by a stray thought -- of the type to which she was frequently subject these days -- that they might never see one another again.

When his head came down, Curt grabbed him by the hair and catapulted him head first into the wall.

When it was followed by a second, whining even closer, Cobb swerved sharply aside into a depression.

When I question them as to what they mean by concepts like liberty and democracy, I find that they fall into two categories: the simpler ones who have simply accepted the shibboleths of their faith without analysis ; ;

This comes out in `` When The Bells Ring '', which describes the rallying of the peasants in southern Sweden to repel an invasion by the Danes.

When we `` forced '' individuals to assume the corporate structure by means of taxes and other legal statutes, we adopted what I would term `` pseudo-capitalism '' and so took a major step toward socialism.

When the proprietor dies, the establishment should become a corporation until it is either acquired by another proprietor or the government decides to drop it.

When the reactionary response is thus bolstered by an intellectual defense, the characteristics of that defense are explicable only in terms of the basic attitudes of unanalyzed reaction.

When he was stripped, deloused and numbered by his guards, his much-thumbed sketchbook was seized and thrown on a pile of prisoners' goods to be confiscated.

When her right hand was incapacitated by the rheumatism, Sadie learned to write with her left hand.

When Captain John Gibault of Salem had visited Burma in 1793 his ship, the Astra, had been promptly commandeered and taken by her captors up the Irrawaddy River.

When decision makers act within this frame they determine whether a claim put forward in the name of religion is to be accepted by the larger community as appropriate to religion.

When Dr. Adenauer was approached by a world citizen delegation to find out his disposition of my case, he gave them his personal approval of my entry, saying that all men advocating peace should be welcomed into Germany.

When, in March, 1640, the two towns were united under Coddington, Gorton claimed the union was irregular and illegally constituted and that it had never been sanctioned by the majority of freeholders.

When Sir Edward Greville enclosed the town commons on the Bancroft, Quiney and others leveled his hedges on January 21, 1600/1, and were charged with riot by Sir Edward.

There is, of course, nothing new about dystopias, for they belong to a literary tradition which, including also the closely related satiric utopias, stretches from at least as far back as the eighteenth century and Swift's Gulliver's Travels to the twentieth century and Zamiatin's We, Capek's War With The Newts, Huxley's Brave New World, E. M. Forster's `` The Machine Stops '', C. S. Lewis's That Hideous Strength, and Orwell's Nineteen Eighty-Four, and which in science fiction is represented before the present deluge as early as Wells's trilogy, The Time Machine, `` A Story Of The Days To Come '', and When The Sleeper Wakes, and as recently as Jack Williamson's `` With Folded Hands '' ( 1947 ), the classic story of men replaced by their own robots.

When founded by Franklin the Gazette was a weekly family newspaper and under its new name its format remained that of a newspaper but its columns gradually contained more and more fiction, poetry, and literary essays.

When East Germans fled to the West by the thousands, paeans of joy rose from the throats of Western publicists.

When Papa went out to do God's work, Stevie often accompanied him in the buggy, which was drawn by Violet, the new black mare.

When the boat had touched, the weaker ones and the two wounded men had been lifted out and carried away by the soldiers.

When they came to Mr. Jack's photograph, twenty by twelve inches in a curly silver frame, Miss Ada said, `` By rights I ought to leave that, seeing he won't take my clotheshorse ''.

When suitable equipment is located by the SBA representative, the small business concern is contacted and advised on when, where, and how to bid on such property.

When more than two figures are separated by subtraction symbols the subtraction must be carried out from the left to right if the result is to be correct.

When Stravinsky shaped his purpose to the shifting scenes of many cultures, many salons, many dialectics, many personalities, he tried to refashion himself into a stylist of many styles, determined by many disparate cultures.

When a Ghyben-Herzberg lens is fully formed, its floating nature will push a freshwater head above mean sea level, and if the island is wide enough, the depth of the lens below mean sea level will be 40 times the height of the water table above sea level.

When it emerges from the specimen, the electron beam carries information about the structure of the specimen that is magnified by the objective lens system of the microscope.

When the object is not distant from the lens, however, the image is no longer formed in the lens's focal plane, and the f-number no longer accurately describes the light-gathering ability of the lens or the image-side numerical aperture.

When used with a parabolic reflector or lens antenna, the phase center of the horn is usually placed at the focal point of the reflector, with the 3 dB points of the horn's radiation pattern set to be at the edge of the reflector.

When the lens first contacts the eye, it should be comfortable.

When the camera lens is not removed ( or cannot be removed ) a common method used is afocal photography, also called afocal projection.

When informed that no lens currently had a wide enough aperture to shoot a costume drama set in grand palaces using only candlelight, Kubrick bought and retrofitted a special lens for these purposes: a modified Mitchell BNC camera and a Zeiss lens manufactured for the rigors of space photography, with a maximum aperture of f /. 7.

When a bright light source is shining on the lens but not in its field of view, lens flare appears as a haze that washes out the image and reduces contrast.

When using an anamorphic lens, as is common in analog cinematography, lens flare can manifest itself as a horizontal lines.

Image: Firework with lens flare. jpg | When the subject of a photo is the light source itself, lens flare can be a desirable and dramatic effect.

When projected through a matching fisheye lens onto a dome, the original panoramic view is recreated.

When the Leica launched, this lens was renamed the ELMAX, for E Leitz and MAX Berek.

When the shutter release is pressed, a light-blocking shield lifts and the shutter disc rotates a full turn exposing the film through its open sector ; when the pressure is released the light-blocking shield returns to its position behind the lens, and the spring motor advances the film and recocks the shutter.

When closed, the viewfinder and lens windows are protected.

When under water, the eyeball's lens serves to focus light, whereas in the in-air environment, the typically bright light serves to contract the specialized pupil, resulting in sharpness from a smaller aperture ( similar to a pinhole camera ).

When we try to focus on far away objects, the ciliary muscles stretch the eye lens, making it thinner, and hence changing the focal length.

When the mirror above the lens is moved too high or too low, it moves out of the best focal distance for an evenly white image, resulting in a projected image with either blue or brown color fringing around the outside edge of the screen.