Show phenomenon of the formation of the newtons rings, Physics

Assignment Help:

The phenomenon of the formation of the Newton's rings can be explained on the basis of wave theory of light. When a light ray iP1 from an extended monochromatic light source S is allowed to fall normally on the system (Plano-convex lenses L+ Plane glass plate P), it gets partially reflected a long P1R1 at point P1 and partially transmitted along the path P1P2 and again reflected by upper surface of glass plate along P2R2 at point P2.

There is no phase change at the lens-air surface i.e. at point P1, because the light ray is going from a medium of higher refractive index to lower refractive index. But at the air-plate surface i.e. at point P2 there is a phase shift of π occurs because the reflection take places from a medium of higher refractive index fig (b).

This is the condition of minimum. That is why the centre of Newton's ring in case of reflected light appear dark and appears bright in case of transmitted light because the effective path difference in that case is ?eff→=0 satisfying the condition of maxima.

From equation (ii) for bright fringe the condition must be satisfied is ?eff=n

From equation (v) and (VI), it is clear that a bright or dark ring of any particular order n will occur at a fixed thickness to which remains constant along a circle with its centre at the point of contact. Hence fringes are known as ‘fringes of equal thicknesses.


Related Discussions:- Show phenomenon of the formation of the newtons rings

Traingle law, derive the triangle law of vector

derive the triangle law of vector

Explain constructive interference, It appears the intensity will be maximiz...

It appears the intensity will be maximized at that positions where path dissimilarity is an integral multiple of wavelength  these points are called as points of constructive inter

Which term have a radian per second unit in physics, In physics, a radian p...

In physics, a radian per second is a unit of: a) Angular displacement b) Angular velocity c) Angular acceleration d) Angular momentum. Ans: A radian per

Determine the mass number of the element, Determine the mass number of the ...

Determine the mass number of the element? A mass of 25.2 g of an element is known to contain 6.77x 10 23 atoms. What is the mass number of the element? I thought it would be

Strong anthropic principle, A more forceful argument which the weak princip...

A more forceful argument which the weak principle: This implies that if the laws of the Universe were not favorable to the development of intelligent creatures to ask regarding the

Define the formula of wien law, Define the formula of Wien law. WIEN'S ...

Define the formula of Wien law. WIEN'S LAW: λ m T = constant Here: λ m = Peak Wavelength (m) T = Surface Temperature (K) Constant = 2.898 x 10 -3 mK It

What is the magnitude of the magnetic induction, The magnetic vector potent...

The magnetic vector potential in a specific region is a constant vector having magnitude 4πX10 5 units and points along the positive x-axis. What is the magnitude of the magnetic

Experiment of a wooden ring stand, A wooden ring stand The bottom for t...

A wooden ring stand The bottom for this ring stand is made from a piece of wood 40 cm long, 15 cm wide and 1 cm thick. A whole 1 cm in diameter is bored by the centre of the ba

Newton law, Newton 2nd law of motion proof

Newton 2nd law of motion proof

Potential energy, Calculate the potential energy of a rock with a mass of 5...

Calculate the potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high.

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