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3 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 Technique to Relate EMF & Rate of Change of Magnetic Flux

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

International Letters of Chemistry, Physics and Astronomy

2015

Vol. 44

50--56

Faradays law of Induction is the principle of generating electricity in Hydro, Thermal, Wind and Nuclear power stations. In this paper we present a method to study the relationship between induced electromagnetic force (EMF) and the rate of change of Magnetic field and hence to verify this principle. This method involves the rotation of a magnet fixed to a rotor at different angular speeds and to find the EMF induced in the copper coil kept close to the rotor. The data collected is plotted in MATLAB. The results show that Induced EMF is directly proportional to the rate change of Magnetic flux with a correlation coefficient of 0.98.

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.