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Whenever a ray of light passes through a lens (except when it passes through the optical center) it bends. The bending of light rays towards the principal axis is called convergence and bending of light rays away from the principal axis is called divergenc..

Whenever a ray of light passes through a lens (except when it passes through the optical center) it bends. The bending of light rays towards the principal axis is called convergence and bending of light rays away from the principal axis is called divergence. The degree of convergence or ..

Prefixes are used for large and small quantities. The following table gives prefixes, their symbol and their values in powers of 10 used in SI units. Prefix Symbol Power of 10 deci d 10 - 1 deka da(D) 10 1 centi c 10 - 2 hecto h ..

Source Electricity Production ( MW) Thermal power(sloar energy) 70,200 Hydel Power 23,800 Nuclear Power 2,700 Wind Power 1,150 Biomass Power 256 ..

Oxidation state Fluorine Chlorine Bromine Iodine - 1 OF 2 - - - + 1 - Cl 2 O Br 2 O - + 2 F 2 O 2 - - - + 4 - ClO 2 BrO 2 I 2 O 4 + 5 - - - I 2 O 5 + 6 - Cl 2 O 6 BrO 3 - + 7 - Cl 2 O 7 - I 2 O 7 All these oxides are pow..

Many scientists believe that our solar system was formed from a giant, rotating cloud of gas and dust known as the solar nebula. According to this theory, the solar nebula began to collapse because of its own gravity. Some astronomers speculate that a nearby supernova (exploding star) triggered the..

For thousands of years people have looked up at the stars and wondered what lay beyond them. It was once believed that the earth was the center of the universe and that everything moved around it. It was later discovered that the earth moves around the sun. Today, powerful teles..

The above resources can be classified as renewable or non-renewable. Some resources are constantly produced on the earth and are known as renewable resources. Others are not replenished and are called non-renewable sources. Resources Renewable resources Non-renewable resources Solar power..

A.C. power gain is defined as the ratio of change in output power to the change in input power. = A v a a . c OR In common emitter transistor amplifier d.c. current gain ( b ) - It is defined as the ratio of the collector current..

Thin Lenses Placed in Contact - Let two thin lenses L 1 and L 2 of focal lengths f 1 and f 2 be placed in contact so as to have a common principal axis. It is required to find the effective focal length of this combination. Let O be a point object on the principal axis. The refractions through the ..