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
What does gravitational force depend on? Gravitational force depends on mass and distance. Therefore, the formula for calculating gravitational force among two objects with

In a certain cathode-ray tube, a beam of electrons, moving at a constant velocity, enters a region of constant electric force midway among two parallel plates that are 10.0 cm long

My question is that if voltage is increased, the electrons will move faster and the distance between them is changed. Why?

ohmmeters: The use of ohmmeters is somewhat more involved. Most importantly when measuring resistance the circuit power must be switched off, power is derived from within the i

Q. Illustrate what is a thermal transformation? Answer:- Chemical or else physical changes are not requiring a change in the temperature of the substance as in the formati

A 4μF capacitor is connected in parallel with a 6μF capacitor. This arrangement is then linked in series with a 10μF capacitor. A supply p.d. of 250V is linked across the circ

AC Input Resistance in Common Emitter Configuration Ratio of change in base emitter  voltage  ( ? V BE )  to  the  resulting  change  in  base  current  ( ? I B )  at  cons

Musical Sounds: Sound that produces pleasant effects on our ear is known as musical sound. Such as sound of flute, violin.

plz derive a equation to magnetic force between short magnetic dipoles at distance apart?

why do we need degenerate semiconductor to fabricate a laser diode?