What do you mean by newtons rings, Mechanical Engineering

Assignment Help:

When a Plano-convex lens of large radius of curvature is placed on a glass plate with its convex surface, a thin air film of gradually increasing thickness is formed between the upper surface of glass plate and the lower surface of the Plano convex lens. When this system is viewed in reflected monochromatic light, then alternate bright and dark concentric rings with their dark centre and formed. These fringes are circular in shape because the air film is symmetrical about the point of contact of lens with the plane glass plate. These rings are known as Newton's rings.

These rings are formed because of the interference between the wave reflected from top and bottom surface of an air film formed between the lens and glass plate.

S is broad source of monochromatic light placed at the focus of lens L1. The light rays emitted from source S are made parallel by lens L1. These emitted light rays are incident on glass plate G1 inclined at 45°, rays and rays reflected from this plate falls normally on the system. (Convex lens and plate). Interference occurs between the rays reflected from upper and lower surface of the film. The interference fringes are viewed by a microscope.


Related Discussions:- What do you mean by newtons rings

Hydrodynamic lubrication, a) State FOUR factors that affect the effectivene...

a) State FOUR factors that affect the effectiveness of hydrodynamic lubrication as a means of reducing friction between components. b) Under what conditions would boundary lubri

Pressure at bottom of a cone, I have a tank that has a 30" dia at the top...

I have a tank that has a 30" dia at the top and is 24" deep. It connects to a cone that is 30" dia at the top and goes to a 15" dia in 12". I plan on filling the tank with golf ba

Complete outer clutch lugs for deep cuts, Complete outer clutch lugs for de...

Complete outer clutch lugs for deep cuts: Visually check for any deep cuts formed on the outer complete clutch lugs.

Explain interpoles or commutating poles, Interpoles or commutating poles ...

Interpoles or commutating poles Interpoles are ?xed to the frame in among main poles. They are used for sparkless commutation, i.e, to improve commutation.

Law of belting, if motion of the belt is reversed, how the law of the belti...

if motion of the belt is reversed, how the law of the belting shall be violated??

Determine the resultant, ABCDEF is a regular hexagon having forces of magni...

ABCDEF is a regular hexagon having forces of magnitude 3, 6√3, 12, 3√3 and 6N which act at ‘A' in the direction of AB, AC, AD, AE and AF respectively. Determine the resultant compl

Physical properties of materials, why is physical properties of materials i...

why is physical properties of materials important in design and for industrial application?

Natural frequency-degree of freedom-conservative system , Natural Frequency...

Natural Frequency: This is the frequency of vibration of a system that is undamped and without external excitation while it is disturbed. Forced Vibration: This is the vibra

Design pumps for plant layout, Q. Design Pumps for plant layout? Pumps ...

Q. Design Pumps for plant layout? Pumps handling flammable or combustible materials are relatively frequent sources of leakage and should therefore be located as far as practic

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