Optics and Light Properties

A vacuum fluorescent display (VFD) is a display device used commonly on consumer-electronics equipment such as video cassette recorders, car radios and microwave ovens. VFD emits a very bright light with high contrast and can support display elements of various colours. VFD's can display seven-segment numerals, multi-segment alpha-numeric characters or can be made in a dot-matrix to display different alphanumeric characters and symbols.

The data is stored on the disc with a laser or stamping machine. Optical discs are most commonly used for storing music and allow a narrower light beam.

A diorama is a model representing a scene with three-dimensional figures, either in miniature or as a large-scale museum exhibit. The word diorama can either refer to a 19th-century mobile theatre device or in modern usage, a three-dimensional full-size or miniature model, sometimes enclosed in a glass showcase for a museum. Dioramas are often built by hobbyists as part of related hobbies such as military vehicle modeling, miniature figure modeling, or aircraft modeling.

Optics is the branch of physics that studies the properties and behavior of light, including its interactions with matter and the construction of instruments that use or detect it. While spectacles and colors are related to optics, they are applications rather than the definition itself. Heat is studied in thermodynamics.

TAF (Terminal Aerodrome Forecast) reports visibility in statute miles (SM) in the United States. This is standard aviation weather reporting format.

Total Internal Reflection is correct. Optical fibers work on the principle of Total Internal Reflection (TIR). Light signals travel through the core (higher refractive index) and when they strike the core-cladding boundary at an angle greater than the critical angle, they are completely reflected back into the core. This allows light to travel long distances with minimal loss. Refraction would cause light to escape, scattering causes loss, and interference is not the principle.

rarer, denser

The object which emit or give out their own light are called luminous object e.g. Sun, Stars, torch, electric bulb, tube light etc.

The object do not allow light to pass through them are called opaque objects and nothing can be see through these objects Eg. Table, chair, book, iron (or any metal)

Air is a transparent mixture of gases which allow light to pass through it whereas soil, rock and wood are the examples of opaque object i.e. they do not allow light to travel through them at all.

To see any object we need to have a source of light that allows us to see the objects

So the objects which allow light to pass partially are called translucent objects.

Whenever an opaque object is kept in the path of the light it forms and dark patch behind itself. This dark patch is known as shadow. It is always black in colour irrespective of the object colour or light colour falling on it. As empty cardboard cartons are opaque so they do not allow light to pass through then and always etc as dark room.

Shadow is always formed by an opaque object. Shape of the shadow depends upon 2 factors:

1.         size of source of light
2.         position of source of light. Smaller the size of light source, larger will be the image, formed and greater is the distance between the object and light source, light will be the image formed. A shadow is always black is colour and is different in size than that of the object.

Whenever an opaque object is kept in the path of the light, it forms a dark patch behind itself. This dark patch is known as a shadow. It is always black in colour irrespective of the object colour or light colour falling on it. So, it is an opaque object and a source of light, required to see the shadow.