A fresnel biprism of index 1.7320 and with apex angle of 0.850 is used to form interference fringes.find the fringe separation for red light of wavelength 6563 when the distance between the slit and the prism is 25 cm and that between the prism and the screen is 75cm.
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Answer:
When slit are of equal width, if I
o
is intensity of light then,
I
max
=I
o
+I
o
+2
I
o
I
o
=4I
o
I
min
=I
o
+I
o
−2
I
o
I
o
=0
Case 2: When slit are of unequal width, intensity from one slit would increase to twice then,
I
newmax
=2I
o
+I
o
+2
2I
o
I
o
=5.83I
o
I
newmin
=2I
o
+I
o
−2
2I
o
I
o
=0.17I
o
Therefore, intensities of both the maxima and the minima increase
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