Formula

Question 1

Minimum Deviation condition

Answer 1

i=e

r1=r2

Question 2

μ value of prism in minimum deviation

Answer 2

μ = sin ( (A + δmin)/2 ) / ( sin (A/2) )

Question 3

Thin prism formula

Answer 3

δ = A ( μ - 1 )

Question 4

Angular dispersion

Answer 4

φ = Α ( μv - μr )

Question 5

Dispersive Power

Answer 5

ω = ( μv - μr )/( μy - 1 )

Question 6

Angular magnification for S microscope at LDODV

Answer 6

m = 1 + d/f

Question 7

Angular magnification for S microscope at inf

Answer 7

m = d/f

Question 8

Angular magnification for C microscope at LDODV

Answer 8

m = - L/fo * ( 1 + d/fe )

Question 9

Angular Magnification for C microscope at inf

Answer 9

m = -L/fo * d/fe

Question 10

Angular Magnification for telescope in Normal Adjustment

Answer 10

m = -fo/fe

Question 11

Angular Magnification for telescope at Near Point adjustment

Answer 11

m = -fo/fe * ( 1 + fe/d )

Question 12

Resolving Power of microscope

Answer 12

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

Question 13

Resolving Power of Telescope

Answer 13

RP = D / 1.22 λ

D = Aperture of Objective
λ = Wavelength of light used

Question 14

Limit of Resolution of Microscope

Answer 14

d = λ / ( 2 μ sinθ )

Question 15

Limit of Resolution of Telescope

Answer 15

dθ = 1.22 λ / D

Question 16

Polarization Vector in Electrostatics

Answer 16

p (->) = χ ε Ε (->)

χe : Electric susceptibility
ε0 : Absolute Permitivity of free space
E (->) : Electric field

Question 17

2 Prism Formulae

Answer 17

A = r1 + r2

A + δ = i + e

Question 18

Magnetic Field due to straight finite wire

Answer 18

B = μ I / ( 4 π R ) * ( sin φ1 + sin φ2 )

φ1 : Angle up
φ2 : Angle down

Question 19

Bohr’s Magneton

Answer 19

μ = e h / 4 π m

μB : Bohr’s Magnetom
e : charge of electron
h : Planck’s Constant
me : Mass of Electron

Question 20

Relation of Magnetic Susceptibility and Permeability of a Material

Answer 20

μ = 1 + χ

μr : Permeability of material
χm : Magnetic Susceptibility

Question 21

Transformer Ratio

Answer 21

k = Ns / Np = ξs / ξp = Ip / Is (only for ideal transformer)

Question 22

Mobility of Charge Carriers

Answer 22

μ = v / E

μ : Mobility
vd : Drift Velocity
E : Electric Field

Question 23

Conductivity and mobility relation

Answer 23

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