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

Angular shear stress.., how is angular shear stress distributed in between ...

how is angular shear stress distributed in between two stanchions

Explain atmospheric pressure, Explain Atmospheric Pressure (P atm ) Atm...

Explain Atmospheric Pressure (P atm ) Atmospheric Pressure is the pressure exerted by atmospheric air on any surface. It is calculated by a barometer. The standard values of it

Steam generator load balancing, Q. Steam Generator Load Balancing? The ...

Q. Steam Generator Load Balancing? The pressure controller output is cascaded to individual stations, one for each boiler. These allow selective increase or decrease of the du

Correction couple, what is correction couple&why it is needed

what is correction couple&why it is needed

Diamond crossing, Diamond Crossing: Two tracks crossing one another i...

Diamond Crossing: Two tracks crossing one another is known as a diamond crossing. The component of a Diamond Crossing are indicated in Figure. Figure: Diamond Cross

Teory of machine, When doescortiles componant of acceleration occurs

When doescortiles componant of acceleration occurs

Varignon, how should we consider positive or negative when summation of for...

how should we consider positive or negative when summation of forces

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