Object
Matter which is tangible and can be
described by attributes like mass.
Oblate
Word
attributed to “Having shape of spheroid generated by rotating an ellipse about
its shorter axis.”
or
“Having
an equatorial diameter greater than distance between poles, flattened at poles.”
Octave
Name given to musical interval with ratio of
frequency as 2:1.
Odd-Even
Nucleus
Nucleus having odd number of protons and
even number of neutrons.
Odd-Odd
Nucleus
Nucleus having odd number of protons and
odd number of neutrons.
Oersted
It is CGS unit of
magnetic field strength. It is equal to force of one dyne acting upon a unit
magnetic pole placed in magnetic field in vacuum. It is equal to 79.577 amperes
per meter.
Ohm
Unit used for resistance.
Ohm’s
Law
At constant temperature, the potential
difference across a conductor is directly proportional to current through it.
Ohmic
Conductor
Conductors which
obey ohm’s law are called as Ohmic conductors. They always have positive slope
in I-V characteristic graph.
Ohmmeter
Device used to measure resistance.
Opacity
Property by which body obstructs light
transmission by absorption or reflection. It determines the degree of opaqueness.
Opaque
Being impervious
to the transmission of light as a result of absorption, reflection and or
scattering of incident light.
Open
System
It is defined as a system which exchanges
both energy and matter with surroundings.
Optical
Bench
An apparatus fitted with light source, lenses,
prism and other optical devices, for observation and measurement of optical
phenomenon.
Optical
Density
It
is measure of extent to which the medium transmits light or electromagnetic
wave of particular wave length.
or
The
degree to which a refractive medium refracts transmitted rays of light.
Optical
Fiber
A very thin transparent fiber made of glass
used to transmit light over long distances without much attenuation. They are
surrounded by transparent cladding material with lower refractive index. Light
is kept in fiber by total internal reflection.
Optics
Branch of physics
which deals with generation, transmission of light, interaction of light with
matter, instruments used for detection of light and devices used to eliminate
aberrations in images formed by optical instruments.
Optoelectronics
It is branch of electronics which deals
with theory, design, manufacture and operation of electronic devices that
converts electrical signal to visible or infrared radiations or from light to
electro signal.
or
The stored energy
which is not apparently shown by a system is called internal energy or
intrinsic energy.
Orbital Gyromagnetic Ratio
The ratio of
magnetic dipole moment of the electron due to its orbital motion is called
orbital gyromagnetic ratio.
Orbital
Velocity
It is velocity of body revolving around the
earth in an orbit. It is independent of mass of orbiting body and it will be
always along the tangent to the orbit at any point.
Ordinary
Ray
One of the two refracted rays obtained from double refracting crystal, which obeys laws of refraction.
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