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2 International Letters of Chemistry, Physics and Astronomy

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On alternative methods of determining Radius of Curvature using Newton’s Rings set up

Raveesha K. H., Kumar K., Prasad B. K.

International Letters of Chemistry, Physics and Astronomy

2015

Vol. 48

27--31

It well known that radius of curvature of a plano convex lens can be determined using Newton’s Rings set up making use of Interference by division of amplitude principle. The general method widely used involves measurement of diameter of several circular dark fringes. We propose two alternative methods involving different formulae. It is based on the fact that, the formation of bright and dark interference fringes is a measure of the thickness of the air film at that point. The methods use simpler geometry and the formulae are easier to derive. We present the experimental data. The results from the experiment are in agreement with results obtained through the general method.

On a method to employ Newton’s Rings concept to determine thickness of thin films

Raveesha K. H., Doddamani V. H., Prasad B. K.

International Letters of Chemistry, Physics and Astronomy

2014

Vol. 3

1-7

Newton’s Rings experiment is traditionally utilized to find radius curvature of a lens. We propose a method in which this same set up can be used to find the thickness of thin films. The working principle is interference. It is based on the fact that, the formation of bright and dark interference fringes is a measure of the thickness of the air film at that point. We present the experimental data. The results from the experiment are in agreement with results obtained through geometry. Further, a method to improvise conventional interference at air wedge experiment which is generally used to determine the thickness of thin films is suggested.