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conductorconductors are those substances which permit electric current to passes easily by themeg metal impure water
insulatorsinsulators are those substances which do not permit to pass electric current by themeg wood plastic rubber glass
electricitythe flow of electron is known as
gamma raysthe wave length of gamma rays is less than 10-11
ultra violet wavesthe wavelength of ultra violet wave from 380mm down to
visible radiation wavesvisible waves have a wavelength range among 400 and 700
infrared wavesinfrared wave also known as heat wave these waves are radiation by hot body at dissimilar
micro wavesmicro waves are radio waves with shorter wavelength among 1mm to 300cm microwaves are used in radar and microwave
radio wavesradio waves are electromagnetic waves with large range of wavelength from a few millimetres to many
dispersion of lightwhen a beam of light is permitted to pass by a prism it splits in a band of different colors this band of different colors is
dual nature of lightas light is accepted as a form of waves as well as packets of photon this nature of light is known as dual nature of
quantum theory of lightwave theory failed to describe some new effects in 19th century a german physicist max plank gave theory about the nature of
newtons corpuscular theorynewtons corpuscular theory of light states that1 light is emitted form of tiny particles is known as corpuscles2 the
the united states is becoming more health conscious and as a resultthe problem of obesity has gotten more attentionthe body mass index bmi relates a
refractive astronomical telescopeit is an optical instrument which is used to see heavenly bodies such as stars moon and planets is known as
working of compound microscopethe object under examination is placed in front of the objective the objective forms its real and inverted image with
compound microscopeit is an optical instrument by which very small object like as biological specimens are seen that cannot be seen by naked
simple microscopea simple microscope of magnifying glass is a convex lens which form virtual erect and magnifying image of an object which is placed
eye chamberthe ball is separated into two chamber the aqueous chamber and the vitreous chamberworkingparallel rays from an object converged by the
retinait is inner most and sensitive layer it receives images of near and far
choroidinside the sclera it is thin non transparent or opaque its front part of iris there is an aperture known as the pupil which control amount of
sclerait is an outer most thick impermeable to light it is more convex and its front part is transparent is known as
human eyeit is spherical in shape diameter about 25 cm having of three layersa sclera
magnifying glassa biconvex lens of short focal length and low power which forms a virtual and magnified image of an object placed with its focal
presbyopiathe accommodation power of a person is lost by which the suffers a long sightedness it is known as presbyopia or lack of