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1. Conditions for constructive and destructive interference
xn=2n
(
l
2
)
D
d
= n
lD
Path difference = (2n - 1) ,
, l = wavelength of light, n = 1, 2, 3,…
xn = (2n-1)
2d
Band width X =
,
2.Wavelength of light from biprism experiment
l =
Xd
=
X
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