Light and Telescopes and Gravity - Research Paper Example

Optics is a common term used to refer to the study of light and its interactions with matter. Reflection is the bouncing back of light on a surface, in most cases resulting in image formation. Refraction on the other hand denotes the bending of the rays of light when passing through one medium to another (124). The speed of light in different transparent materials with ordinary matter is lower than that in a vacuum. For instance, the velocity of light in water is 75% the speed of light in a vacuum.

The behavior of light is dependent on its wavelength and like other electromagnetic radiations high frequencies translate into lower wavelengths and vice-versa. Light is made up of photons/ quanta of lower energy levels which evoke excitations (electronic) in the molecules it interacts with resulting in variations in the chemistry/ bonding of the molecule. In the lower portion of the spectrum of light, the radiation (infrared) is no longer visible as the quanta of these radiation lack energy sufficient to elicit variation in molecule retinal of the eye retina, hence no visibility (at least not via quantum absorption) (Walker, 418).

Over the limit of visible light, UV radiation is not visible to human eyes because it is absorbed by the internal lens below 400nm and the cornea below 360nm. In addition, the human retina’s cones and rods cannot detect radiation of wavelength below 360nm and are destroyed by such radiation. The main source of light on earth is the sun with approximately half of the EMR from the sun in the visible light region. However, there are a plethora of other light sources and mechanisms of producing light such as bioluminescence, electroluminescence, sonoluminescence, scintillation, radioactive decay, triboluminescence, particle-antiparticle annihilation, chenkov radiation, and so on.

Light is either measured via photometry or radiometry. Light applies physical pressure on objects along its path with its