Evaluate diameters of bright and dark newtons rings, Physics

Assignment Help:

Q. Evaluate Diameters of Bright and Dark Newtons Rings?

Let ‘R' is the radius of curvature of a Plano-convex lens resting at a glass plate PQ. If t be the thickness of air film at a point B, a nth order ring of radius AB = rn is formed there. Since the thickness of air film at point of contact of Plano-convex lens and glass plate is zero (t=0), then from equation (ix) rn = o i.e. the radius of ring is zero, implies a point, (a point has zero radius). That's the reason Newton's ring have a dark centre.

The centre may be bright if some dust particles are there and plane glass plate and Plano convex lens are not in contract then t ≠ 0.


Related Discussions:- Evaluate diameters of bright and dark newtons rings

AND GATE, types of ANDGATE circuit and gate operation

types of ANDGATE circuit and gate operation

How many types fitting are there, How many types fitting are there? Lit...

How many types fitting are there? Literally thousands for all thought or dreamed up application. By small bullet lenses uses very large floor, pool and pavers lights. From simp

Fringes in youngs double slit experiment, How does the distance between fri...

How does the distance between fringes in Young's double slit experiment change. a) If the colour of the light is changed from red to blue? b) If the slit separation is incre

Are optical fiber fraglle, Are optical fiber fraglle? Glass fibers are...

Are optical fiber fraglle? Glass fibers are very brittle, actually in any glass light guide there is a percentage of fibers broken throughout the manufacturing process, conver

Evaluate the maximum work done, 10 moles of an ideal gas expands reversibly...

10 moles of an ideal gas expands reversibly and isothermally from a volume if 5 lit. to 50 lit. at 25°C. Find the maximum work done? Express the result in Joules.

Distinguish between metals and semiconductors, (a) Distinguish among metals...

(a) Distinguish among metals, insulators and semiconductors on the basis of their energy bands. (b) Why are photodiodes used preferably in reverse bias condition? A photodiode i

What is speed of an electron and a proton in circular path, An electron and...

An electron and a proton are moving at the similar speed in circular paths in the similar uniform magnetic field.  The radius of the path of the proton is one of the following.

What is the wavelength of the light, The width of the central bright band o...

The width of the central bright band of a diffraction pattern is 2.9 cm. Laser light of unknown wavelength passes through a single slit that is 0.042 mm wide and onto a screen

Determine the weight of a body, Determine the weight of a body. Princip...

Determine the weight of a body. Principle: When a spring is fixed at one end and a force is applied to the other end the stretching of the spring is proportional to the applie

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