In Newton ring experiment diameter of 5th and 15th rings are 0.3 and 0.62 then calculate the diameter of 25th ring
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Explanation:
Physics
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
Answer
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
.
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