In optics, the refractive index or index of refraction n of a material is a dimensionless number that
describes how light propagates through that medium. It is defined as
where c is the speed of light in vacuum and v is the phase velocity of light in the
What is the minimum distance between the object and the image in a double convex lens to have a real
We see an object because light from the object travels to our eyes as we sight along a line at the object.
Similarly, we see an image of an object
A chemical bond is the phenomenon of chemical species like atoms held together by electrostatic
or electronic forces. Of several types of chemical bonds, a special type exists in the molecule of
boron hydride BH3 which exists as a dimer B2H6 molecule. It
Elimination reactions are a class of organic chemical reactions in which a pair of atoms or groups
of atoms are removed from a molecule, usually through action of acids, bases or metals and by
heating to a high temperature. It is the principal process by
Magnetic fields generated by current-carrying wires:
Circular magnetic fields are generated around current carrying wires. Strength of these fields varies
directly with size of the current flowing through wire and inversely to distance from the wire.