The fluence of any given ray through the tumor may be determined by summing the charges along the ray's path.

Extending the path of both external rays to their intersection with the optical axis, locates two point which are named nodes.

The duration of the pulses of the laser pulse is adjusted, in particular, by selecting the beam path within the laser resonator thereby ensuring optimum material removal.

When deflection occurs in the support structure (30), the targets (22) are concurrently displaced into the path of the laser beam (16).

The period of the clock H' is "true" because it corresponds to the path of the light beam that is physically traveled in the Preferred Frame of Reference.

The apparatus contains a tubular screening system (2) which is arranged in the beam path and has a sequence of screening shields (4) and radiation absorption chambers (5).

A coloured filter adapted to the basic human sensitivity is arranged in the path of the reflection ray (R) between the colour separator (4) and the sensor (7).

Below is illustrated how the path of the lightray would look from the outside (B), to a stationary observer on the earth.

Roland, Susannah, and Eddie must draw Jake into Mid-World then follow the Path of the Beam all the way to the Dark Tower.

Roland, Susannah, and Eddie must draw Jake into Mid-World and then follow the Path of the Beam all the way to the Dark...

Roland, Susannah, and Eddie must draw Jake into Mid-World and then follow the Path of the Beam all the way to the Dark Tower.