Get 65% Discount on Preventive Health Checkup
Career in India        

MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Interference of Light Formulae Page 1

‹‹ Previous  |  Formulae Page 1  |  Next ››



1. Conditions for constructive and destructive interference

 

  1. Condition for brightness:
    Path difference =
    nl, l = wavelength of light
    (
    n = 0, 1, 2, 3, )
    Distance of nth bright band from central bright fringe ( CBF )

xn=2n 

(

l

2

D

d

 = n 

lD

d

  1.  
  2. Condition for darkness :

Path difference = (2n - 1) ,  

l

, l = wavelength of light, n = 1, 2, 3,

2

  1. Distance of nth dark band from central bright fringe ( CBF )

xn = (2n-1) 

lD

2d

  1.  
  2. Band width :
    Distance between two consecutive bright bands = Distance between two consecutive dark bands

Band width X = 

lD

 ,

d

  1. l : wavelength of light
    D : Distance between screen and source
    d : distance between sources

 

2.Wavelength of light from biprism experiment

 

l

Xd

D

 

=  

X

D


X : band width
d : distance between coherent sources
D : Distance between sources and screen
d1: distance between magnified images
d2: distance between diminished images

d1 =  

vd

u

 

d2 =  

ud

v


u + v = D

u : Distance between slit and lens
v: Distance between lens and eyepiece

 

 

 

‹‹ Previous  |  Formulae Page 1  |  Next ››


Career in India | Jobs in India
© All Rights Reserved, indicareer.com | partners | Sitemap