Space, Science and Technology

Brewster’s Law: In 1811 Brewster’s proposed it . When   Un-polarized   light is incident at the angle called Brewster’s angle or angle of polarization , the light that is reflected from the surface is therefore perfectly polarized . He was able to prove that the tangent of the angle of polarization is numerically equal to the refractive index of the medium. That is....

Polarization:   Polarization   is a property of waves   that describes the orientation of their   oscillations. If a wave oriented to a single direction is called polarization. We can get Polarized Light form Un Polarized light by under way 1.      Repletion 2.      Refraction 3.      Scattering ( বিচ্ছুরন ) 4.      Selective Absorption 5.      Double Polarization

DNA profiling is a technique to identify of individuals on the basis of their respective DNA profiles. DNA profiles are encrypted sets of numbers that reflect a person's DNA makeup, which can also be used as the person's identifier. DNA profiling should not be confused with full genome sequencing.It is used in, for example, parental testing, crime investigation and rape investigation.DNA profiling is being increasingly used to identify criminal suspects as well as in many other fields throughout the world.Apart from criminal investigations, DNA profiling is used in paternity test, immigration disputes, establishing family link, inheritance dispute and identifying unknown victims from accidents and disasters.DNA technology has also been used in a number or murder cases as well as in paternity tests.

RAM-Random Access Memory SRAM-Static Random Access Memory DRA-Dynamic Random Access Memory ROM-Read Only Memory PROM-Programmable Read Only Memory EPROM-Erasable Programmable Read Only Memory EEPROM-Electrically Erasable Programmable Read Only Memory CPU-Control Processing Unit ALU-Arithmetic and Logic Unit CU-Control Unit

Basic Stricture of a Computer system:                      Input Unit:  Input Unit takes data by Input device. An   input device   is any   computer hardware   equipment used to provide data and control signals to an information processing system . Here information processing system is CPU. Input Unit converts any input Data into Binary format.    Memory Unit: Memory unit has two Divisions. 1.      Primary Memory 2.      Secondary Memory

Light: Light   is   electromagnetic radiation   of a   wavelength   that is   visible   to the   human eye   (in a range from about 380 or 400   nanometers   to about 760 or 780 nm).  In   physics, the term   light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. To describe light there are 4 theories: 1.      Corpuscular theory of light 2.      Wave theory 3.      Electromagnetic theory 4.      Quantum theory of light  

Galaxy: Where it’s goes and where it’s from? What is galaxy? Yes, a galaxy is a system of stars, dust, and gas held together by gravity. Galaxy is the small portion of our universe. Many stars make a galaxy.   Typically a galaxy contain ten million   (10 7 )  to hundred   trillion   (10 14 ) stars. It depends on galaxies size. Small galaxies have fewer than a billion stars called Dwarf galaxy . Large galaxies have more than a trillion called Giant galaxy . Scientists estimate that there are more than 100 billion galaxies scattered throughout the visible universe. Our solar system is also in a galaxy called the Milky Way.