Question

the diameter of the third dark ring in a newton's ring system viewed normally by sodium light is 20nm.calculate the radius of the curvature of the lens and the thickness of the air film.​

Answer 1

Answer:

bbhjh dr citctuxfuxf, JTXTIXIFIYFOUFOG

Answer 2

Explanation:

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

.