Formula Flashcards
Minimum Deviation condition
i=e
r1=r2
μ value of prism in minimum deviation
μ = sin ( (A + δmin)/2 ) / ( sin (A/2) )
Thin prism formula
δ = A ( μ - 1 )
Angular dispersion
φ = Α ( μv - μr )
Dispersive Power
ω = ( μv - μr )/( μy - 1 )
Angular magnification for S microscope at LDODV
m = 1 + d/f
Angular magnification for S microscope at inf
m = d/f
Angular magnification for C microscope at LDODV
m = - L/fo * ( 1 + d/fe )
Angular Magnification for C microscope at inf
m = -L/fo * d/fe
Angular Magnification for telescope in Normal Adjustment
m = -fo/fe
Angular Magnification for telescope at Near Point adjustment
m = -fo/fe * ( 1 + fe/d )
Resolving Power of microscope
RP = 2 μ sinθ / λ
μ = RI of intervening medium (eg air) θ = Semi vertical angle subtended by the object at objective λ = Wavelength of the light used
Resolving Power of Telescope
RP = D / 1.22 λ
D = Aperture of Objective λ = Wavelength of light used
Limit of Resolution of Microscope
d = λ / ( 2 μ sinθ )
Limit of Resolution of Telescope
dθ = 1.22 λ / D
Polarization Vector in Electrostatics
p (->) = χ ε Ε (->)
χe : Electric susceptibility
ε0 : Absolute Permitivity of free space
E (->) : Electric field
2 Prism Formulae
A = r1 + r2
A + δ = i + e
Magnetic Field due to straight finite wire
B = μ I / ( 4 π R ) * ( sin φ1 + sin φ2 )
φ1 : Angle up
φ2 : Angle down
Bohr’s Magneton
μ = e h / 4 π m
μB : Bohr’s Magnetom
e : charge of electron
h : Planck’s Constant
me : Mass of Electron
Relation of Magnetic Susceptibility and Permeability of a Material
μ = 1 + χ
μr : Permeability of material
χm : Magnetic Susceptibility
Transformer Ratio
k = Ns / Np = ξs / ξp = Ip / Is (only for ideal transformer)
Mobility of Charge Carriers
μ = v / E
μ : Mobility
vd : Drift Velocity
E : Electric Field
Conductivity and mobility relation
σ = e ( n1 μ1 + n2 μ2 )
e : charge of electron n1 : number of holes n2 : number of electrons μ1 : mobility of holes μ2 : mobility of electrons
