Essay on Polarized Light

Polarization refers to the track of the electric field in an electromagnetic wave. A wave whose electric field is oscillating in the perpendicular direction is said to be polarized in the vertical direction. The photons of such a wave would interact with matter in a different way than the photons of a wave polarized in the horizontal direction. The electric field in light waves from the Sun vibrates in all directions; so direct sunlight is called unpolarized. Sunlight reflected from a surface is to some extent polarized parallel to the surface. Polaroid sunglasses block light that is horizontally polarized and as a result decrease glare from sunlight dazzling off horizontal surfaces.

Natural daylight and nearly all forms of fake enlightenment transmit light waves whose electric field vectors vibrate equally in all planes perpendicular to the direction of propagation. When their electric field vectors are restricted to a single plane by filtration, however, then the light is polarized with respect to the direction of propagation. Even unpolarized incident light, such as natural sunlight, is polarized to a certain degree when it is reflected from an insulating surface like water or a highway. In such cases, the electric field vectors of light parallel to the insulating surface are reflected to a greater degree than vectors with different orientations. On the other hand, the optical properties of the surface principally agree on how much of the reflected light is polarized. For example, the properties of mirrors make them very poor polarizers, while many transparent materials are excellent polarizers if the angle of incident light is within certain limits. The particular angle inducing maximum polarization is known as the Brewster angle and is expressed by the equation:
n = sinq(i)/sinq(r) = sinq(i)/sinq(90-i) = tanq(i)

where n is the refractive directory of the medium, q(i) is the angle of incidence, and q(r) is the angle of refraction...................

ESSAYS ON TECHNOLOGY