Measure wavelength of light used in newton''s ring experiment, Physics

Q. How shall you measure wavelength of light used in Newton's ring experiment? Derive the formula used. 

Measurement of Wavelength of Monochromatic Light using Newton’s Ring Methods:

Light from monochromatic extended light source is allowed to fall on a glass plate G inclined at angle of 45? to the incident beam and is reflected normally on to a convex lens L of very large radius of curvature placed on a plane glass plate P. As a result concentric alternate bright and dark fringes are formed in the air film between the lens and the glass plate. These fringes are observed by means of a microscope M focused on the air film and their diameters are measured.

Procedure: After obtaining a good contract ring pattern in field of view we have to follow the following steps in order to measure A.

1.    Move the microscope in horizontal direction to bring its crosswire at the centre of the microscope.

2.    Now, counting the rings by moving microscope in one side and set the cross: wire YY’ tangential to one of the rings and note down the reading of microscope.

3.    By moving the microscope towards centre of pattern note down the readings for alternation ring.

4.    Now repeat the same procedure on the other hand for the same number of rings while moving on other side.

5.    From these reading calculate the diameter of each ring.

Now choose a suitable value of m, find average value of D2n+m – D2n and calculate the value of ¥. Value of r i.e. radius of curvature of Plano convex lens can be calculate using speedometer. Same procedure is used for the measurement of reflective index of given liquid.

Posted Date: 7/12/2012 7:22:44 AM | Location : United States







Related Discussions:- Measure wavelength of light used in newton''s ring experiment, Assignment Help, Ask Question on Measure wavelength of light used in newton''s ring experiment, Get Answer, Expert's Help, Measure wavelength of light used in newton''s ring experiment Discussions

Write discussion on Measure wavelength of light used in newton''s ring experiment
Your posts are moderated
Related Questions
(Assume the metallic ball is spherical with a diameter d = 2.5 cm. Let''s also assume it is made out of nickel, which has a density of roughly 9 g/cm 3 .) After it first touches

,adf'';,g.'';fd,g'' fmdlg;lmdf

Lagrange points: Points within the vicinity of two massive bodies (like the Earth and the Moon) where each others' respective gravities balance. There are five, labeled L1 to

A 42.0-kg skateboarder travelling at 1.50 m/s hits a wall and bounces off of it.  If the magnitude of the impulse is 150.0 kg·m/s. Calculate the final velocity of the skateb

What is meant by tunnelling phenomenon? A tunnel diode is a high conductivity two-terminal P-N junction doped heavily about 1,000 times higher than a conventional junction diod

composition of two simple harmonic motions at right angles to each other and having time periods in the ratio 1:2

Explain the types of polymorphism In terms of  thermodynamics, there are two kinds of polymorphism. For a monotropic system, a plot of the free energy of the various polymorphs

Break a stick with inertia Secure a small stick 18 to 20 cm in length. If no other stick is available a lead pencil will do. Fold a newspaper and place it near the edge of a ta


Urticaria  :  a skin condition characterized by the development of itchy, raised  white lumps surrounded  by  an  area  of  red inflammation. Osmolarity  :   The osmotic  conc