why a mirror has one principle focus while a lens has two principle foci

This method is based on the fact that: Total vapor pressure above a mixture of two immiscible liquids is equal to the sum of the vapor pressures of the individual liquids i.e., P t o t a l = P 1 + P 2 Hence, P 2 = P t o t a l - P 1..

The principle behind this technique is the differential adsorption of the various components of a mixture between two different phases that are as follow..

Distillation involves the conversion of a liquid into its vapors upon heating and then cooling the vapors back into the liquid. Depending on the difference in boiling points of liquids, distillation is of two types: simple distillation and fractional distillatio..

These elements are estimated by its combustion in an atmosphere of pure oxygen to form carbon dioxide (CO 2 ) and water (H 2 O). ..

The mother liquor remaining after the precipitation of sodium bicarbonate contains ammonium chloride. This is used to regenerate ammonia (one of the raw materials) by steam heating with milk of lime. Ammonia and carbon dioxide liberated are utilized in making the whole process cyclic and ..

If two events E 1 and E 2 can occur independently in exactly m ways and n ways respectively, then either of the two events can occur in (m + n) way..

then the forces experienced by any one charge due to the other charges can be written mathematically as follows: where f 1 is the net force experienced by the q 1 charge and f 1 2 , is the force experienced by q 1 due to q 2 , f ..

The Aufbau principle states that in the ground state of an atom, an electron enters the orbital of lowest energy first, and then the subsequent electrons are fed in the order of increasing energies into the orbitals. The relative energies of various orbitals are given in fig.1.6..

The same principle can be generalized to three or more events occurring in succession as follows: If n operations can be performed in m 1 ,m 2 ,m 3 ,...m n ways respectively, then all n operations in succession can be performed exactly in m 1 ,m 2..

Christian Huygen Huygen proposed a hypothesis for the geometrical construction of the position of a common wavefront at any instant during the propagations of waves in a medium. The postulates are: Every point on the given wavefront called 'primary wavefront' acts as a fresh source of new dis..