Effect on newton''s ring, Physics

Assignment Help:

Q. What will be effect on Newton's rings if;

(i)      A little oil (µ = 1.65) is introduced between the lens (µ - 1.5) and the glass plate (µ = 1.75).

(ii)    A Plano-convex lens of small radius is used.

(iii)   A plane mirror is placed instead of the glass plate below the Plano-convex lens.

(iv)   The Plano-convex lens is raised by height ?h from the surface of plane glass plate.

(v)    Interference fringes are produced by monochromatic light falling normally on wedge shaped film of cello phase whose refractive index is 1.4. The angle of wedge is 40 seconds and distance between successive fringes is 1.25 mm. Calculate wavelength of the light used.                  [R.T.U. (II Sem.) 2008]

Sol.(a) (I) When a little oil (µ = 1.65) is introduced between the lens (µ = 1.5) and the glass plate (µ = 1.75) as shown in fig. then is this situation both the boundaries i.e. lens to oil and oil to glass plate both are rarer to denser type, so a phase change of π will occur at both the boundaries. In result dark and bright rings (fringes) will interchanged within the area of liquid.

(ii) As we know that diameter of bright and dark ring is directly proportional to the square root of the radius of curvature of the lens. Hence if we use a lens of small radius of curvature, the diameter of the rings will be small and rings will get closer, This will effect on the percentage error in the measurement of diameter.

(iii) If we use plane mirror instead of glass plate the rays transmitted by the air film and striking the mirror will get reflected and no part will be transmitted at all, due to superposition of reflected and transmitted light a general illumination will formed and no fringe will be found i.e. Newton's ring will disappear. Because the condition of maxima and minima for reflected and transmitted light are just opposite to each other.


Related Discussions:- Effect on newton''s ring

Select the pairs of isotopes, Q. Select the pairs of isotopes, isobars and ...

Q. Select the pairs of isotopes, isobars and isotones from the following nuclei: 11 Na 22 , 12 Mg 24 , 11 Na 24 , 10 Ne 23 Isotopes are 11 Na 22 , 11

Spring force, just after cutting of spring will extension becomes zero or n...

just after cutting of spring will extension becomes zero or not

Illustrate the various modes of vibrations in a closed pipe, Con you descri...

Con you describe harmonics? How are stationary waves formed in a closed pipe? Illustrate the various modes of vibrations in a closed pipe and establish the relation between their f

Daltons law of partial pressures, Dalton's law of partial pressures (J. Dal...

Dalton's law of partial pressures (J. Dalton) The overall pressure of a mixture of ideal gases is equivalent to the total of the partial pressures of its components; i.e., the

Ultrasonic, how faster ultrsonic waves will travel in solids.

how faster ultrsonic waves will travel in solids.

Problems/force-mc-rotating-two-masses.tex, A block of mass m is tied to a c...

A block of mass m is tied to a cord of length L that is pivoted at the center of a frictionless table. A second block of mass m is tied to the ?rst block also on a cord of length L

Executing simple harmonic motion, The total energy of a particle, executing...

The total energy of a particle, executing simple harmonic motion is Ans) In simple harmonic motion when  a particle is displaced to a position from its mean position, then its kin

Fourth harmonic-standing waves on a string, Fourth Harmonic-Standing Waves ...

Fourth Harmonic-Standing Waves on a String There are a variety of patterns that could be generates through vibrations inside a string, slinky, or rope. Every pattern correspond

Calculate percentage, By what percentage should the pressure of a given mas...

By what percentage should the pressure of a given mass of gas be increased,so as to decrease its volume  by 10% at a constant temperature.

Release of energy by the process of nuclear fusion, Draw a graph showing th...

Draw a graph showing the variation of binding energy per nucleon with mass number for dissimilar nuclei. Describe, with the help of this graph, the release of energy by the process

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd