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state in brief about gullstrands theorya change in the lens is controlled by the balance between elasticity of the lens capsule and the pull of
explain in brief about the ciliary muscleduring accommodation the ciliary muscle contracts and in turn the size of the ciliary ring is reduced this
what is the curvature of the lens in a human being and most other mammals the first three mechanisms are not possible and accommodation occurs by the
mechanisms of different species of animal in an animal when the need to change the focal power of the eye arises different mechanisms are there in
what is human eye accommodationthe human eye focuses at objects at infinity without exerting any power this means that when a person is observing an
explain the types of polymorphismin terms of thermodynamics there are two kinds of polymorphism for a monotropic system a plot of the free energy
what is packing polymorphismwhen polymorphism exists as a result of change in crystal packing it is called packing polymorphism polymorphism can also
what is polymorphismpolymorphism in materials science is the skill of a solid material to exist in more than one form or crystal structure
define the interplanar spacing in miller indicesinterplanar spacing d in a cubic latticeinterplanar spacing into a cubic crystal is specified byd
the caesium chloride structurecscl structure is basically a simple cubic lattice with 2 atom basis where one atom is attached to the lattice
the sodium chloride structure nacl is an ionic crystal and in this crystal the sodium and chlorine ions are located side-by side in the fcc
explain the procedure of finding miller indicesprocedure of finding miller indicesa the intercepts of the needed plane onto the three coordinate axes
define about the graphite structure graphite is the allotropic form of carbon in case of graphite the carbon atoms are arranged in regular
state the uses of zinc sulphidezinc sulphide has a lattice constant of 0596nm the sulfide ions are quite big atomic radius 184 pm relative to the
the zinc blende or sphalerite structurezinc blende is same to diamond cubic structure but the two fcc sub-lattices are occupied by atoms of two
determination of packing fraction of diamond the co-ordination number of an atom in diamond structure is 4 as can be seen from the unit cell of
process to calculate teh number of atoms per unit cellthe number of atoms per unit cell is equal to the product of the number of atoms per basis and
normal 0 false false false en-in x-none x-none
calculation of number of atoms per unit cellthe number of atoms per unit cell occurs on the crystal structure and the kind of basic elements basis or
why material in solid state are crystallinemost of the materials in solid state are crystalline between these many are in the polycrystalline state
describe the term amorphous solidsamorphous solidssolids along with particles not arranged in an ordinary fashion they have merely short range order
explain about the crystalline solids in shortcrystalline solidsa solid possesses rigidity with a definite geometric patternillustrationsiron silver
what are the applications of transmission electron microscopeapplications of the transmission electron microscope tema the tem is used into both
what are the limitations of transmission electron microscopelimitations of transmission electron microscopea in tem the materials need extensive
illustrates the principle of transmission electron microscopeprinciple of transmission electron microscopethe electron microscopes are worked onto