Light ray

Figure Bl.18.1. Light rays and imaging lenses in the microscope. The illumination system is not included.

Figure 10.10 Interference of light rays scattered by segments j and k in a polymer chain. Destructive interference increases with increasing 6.

A modem use of uranine is in the manufacture of fluorescent laminates, eg, sheets, glass, and plastic films, that are transparent to electromagnetic waves and visible light rays (45). Such material might be used in windows, viewing partitions, and optical lenses. 

Laser alignment systems use a transmitter and receiver. The system has a laser diode and a position sensor on a bracket mounted on one shaft that emits a weak and safe radio-tagged beam of light. The light ray is directed toward the other bracket on the other shaft with a reflecting prism that returns the ray back toward the first bracket into the position sen.sor eye. 

We do not need a hand lens to feel the energy of light rays. Just remember those lazy afternoons you spent last summer soaking up the warmth of the sun. The afternoon pleasure... 

Light rays situated beyond the red end of the visible spectrum generated during combustion and detected by a flame scanner. 

Figure 2. The focal length is the distance between the principal plane and the focus, where the principal plane is defined as the surface where tlic input and out-pul light rays would intercept.

Fig. 11.4 The microgravitation lens method, which will probably be the method of choice in the future. When the invisible planet appears to pass in front of the central star, its gravitation acts like a lens, which focuses the star s light rays. There is a temporary increase in the star s tight intensity and an apparent shift in its position...

The index of refraction is a measure of the ability of the alkane to bend (refract) light rays. The values reported are for light of the D line of the sodium spectrum ( D). 

When the oscillating electric held of an incident light ray interacts with a molecule, a small oscillating dipole moment is induced in the molecule as a consequence of its polarisability, a. Polarisability itself is a measure of the change in the dipole moment of a molecule induced by an electric held, and in the simplest case, where the electric held E and induced dipole moment p are in the same direction ... 

Consider a linearly polarised monochromatic light ray incident on a metal surface. Such a ray can always be resolved into two orthogonal components and if the plane of reflectance at the metal is chosen as the reference, then these components correspond to S- and P-polarised light, as discussed in the previous section. 

Because of translational symmetry special directions occur in crystals and it often happens that the electric fields associated with light rays transmitted through a crystal are channeled to vibrate in a special direction that provides an easy passage. This means that the light becomes polarized. 

Fig. 9.1 Cross section of a simple three layer slab waveguide, and a plot of the fundamental mode intensity profile. Light rays (dashed line) in the waveguide are confined by total internal reflection at the core cladding interfaces...

---