In newton's rings experiment,diameter of 10th dark ring formed by light of wavelength 6000A is 0.3 cm.Calculate the radius for the lens.
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In a Newton's Ring experiment, the diameter of the 20
th
dark ring was found to be 5.82 mm and that the 10th ring 3.36 mm. If the radius of the planoconvex lens is 1 m, calculate the wavelength of light used
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Diameter of the 20th dark ring.
D
20
=5.8 mm=5.82×10
−3
m
Radius of the 20th dark ring
r
20
=2.91×10
−3
m
Diameter of the 10th dark ring
D
10
=3.36 mm=3.36×10
−3
m
Radius of the 10th dark ring
r
10
=1.68×10
−3
m
Radius of plano-convex lens (R)=1 m
Wavelength of light
=
mR
r
n+m
2
−r
n
2
=
10×1
[(2.91×10
−3
)
2
−(1.68×10
−3
)
2
]
=
10
[8.4681−2.8224]×10
−6
=0.5646×10
−6
=5636
A
o
.
Explanation:
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