Because even a laser beam spreads significantly at the distances involved, only a few photons of light are captured at the receiving end.
12.
In explaining how an ellipse evolves into a parabola, for example, Seife suggests gradually tilting a flashlight as its beam spreads upon a wall.
13.
PAR lamps come in multiple beam spreads, to spread the light out on the floor, from a broad spread to a very narrow pinpoint.
14.
Even so, the beam spreads slowly so that it is more than 4 miles wide at the Moon and 12 miles wide upon return.
15.
And as word of the capabilities of electron beams spreads, food processors are lining up to have test batches of their products irradiated, as well.
16.
Like an old-fashioned automotive headlight, the reflector is integral to the lamp and the beam spread of the unit is not adjustable except by changing the lamp.
17.
Some feel that in poor visibility, or at short range, a narrow beam is not much use, and a wider beam spreads the light over a more useful area.
18.
These systems are limited by wavelength, which is 0.03 meter at Ku band, so the beam spread exceeds 45 degrees if the antenna is smaller than 12 inches ( 0.3 meter ).
19.
Three more beams spread out from the base of the nacelle upwards, the outer pair joining those from the upper wing forming the tailplane extremities and the central one supporting the rudder and inner tailplane.
20.
Split by the grating in the MIT apparatus, two parts of the sodium beam spread apart along separate trajectories and then hit a second grating that channels them into an interaction section consisting of two chambers.
