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What is a Fluorescent Lamp?

Fluorescent lamps are essentially cylindrical glass tubes that are coated with phosphorus and filled with a noble gas. They also contain a small amount of mercury inside. Conventionally, these lamps are shaped as hollow cylinders.

19 Sep 2014

Neutral Density Filter - Definition and Properties

A neutral density filter is a semi-transparent glass filter used in front of a camera lens to reduce or vary the intensity of incoming light without affecting the color rendition.

18 Sep 2014

What is an LED?

Light emitting diodes (LED) maybe defined as a semiconductor device that generates light by using the solid sate electronics.

18 Sep 2014

The Photoelectric Effect

In 1921 Albert Einstein won the Nobel Prize for discovering the law which governs the photoelectric effect.

From Pittcon 16 Sep 2014

Maxwell's Electromagnetic Theory of Light Propagation

Maxwell’s most significant scientific achievement was his electromagnetic theory of light propagation which he first presented in 1864.

From Pittcon 16 Sep 2014

Charles Kao and Fiber Optics in Telecommunications

The development of fiber optic technology has driven the dramatic progression of telecommunications.

From Pittcon 16 Sep 2014

What is a Wavenumber?

Wavenumber is defined as the number of complete wave cycles per unit length of a linear space. It can also be referred to as the spatial frequency of the waves represented in radians per unit distance, or cycles per unit distance.

16 Sep 2014

What are Photons?

The term photon was coined by Gilbert Lewis in 1926. A photon is a type of elementary particle that forms the basic unit of electromagnetic radiation, which includes infrared, ultraviolet, visible light, X-rays, radio waves, and gamma rays.

15 Sep 2014

What is a Prism?

A prism is a transparent geometric optical object with a minimum of two polished plane faces inclined relative to each other, from which light is reflected or through which light is refracted.

12 Sep 2014

What is a Periscope?

A periscope can be defined as an optical instrument that allows the viewing of objects that are not in the direct life of vision. Periscopes prove to be of great help to submariners to have a view of the outside view.

11 Sep 2014