What do you mean by ant reflecting films, Physics

Assignment Help:

Q. What do you mean by Ant reflecting Films?

When a beam of light travels normally from a medium of refractive index µ2 to a medium of refractive index µ1, a part of light is refracted and a part of light is transmitted, then reflecting and transmitting coefficients can be given as Such types of film are called Anti-Reflecting Film.

Consider Fig. given, an incident light reaches to an air-film interface. Some of it reflects back to the air and some of it transmits into the film. The transmitted part refracts in the films and reaches to a film substrate interface. Some of it reflects back to the air and some of it transmits into the substrate. The two reflected waves, which are generated at the film air interface and the substrate film interface, interact and produce a resultant reflected light waves.

The intensity of the net reflected light depends on the optical thickness of the film. Optical thickness of a film is given by,

T = n d

When n is the refractive index and d is the physical thickness of the film. If the optical thickness of the film is a quarter waves, the phase difference of the two reflected waves is π. They become out of phase and interfere destructively. Then, the net intensity of the reflected wave is at minimum. If the optical thickness of the film is a half wave, the phase difference of the two reflected waves is 2π. They become in phase and interfere constructively. Then, the net intensity of the reflected wave is at maximum.


Related Discussions:- What do you mean by ant reflecting films

#Inductance balanced delta connected load, how to you calculate the inducat...

how to you calculate the inducatnce on a balanced delta circuit?

Propagation of an electromagnetic wave, Propagation of an Electromagnetic W...

Propagation of an Electromagnetic Wave Electromagnetic waves are waves that can travel by the vacuum of outer space. Mechanical waves, not like electromagnetic waves, need the

Magnetic effects of electric current, How to find out neutral point ? What...

How to find out neutral point ? What all things we require to equate or form a equation to find the neutral poind and how to do it?

Condition for diffraction, Why diffraction can't occur if slit width is les...

Why diffraction can't occur if slit width is less than the wavelength of the light? Can you explain?

Electrical susceptibility, It is a measure of how easily a dielectric mater...

It is a measure of how easily a dielectric material polarizes in response to an electric field.

Explain the schematic diagrams of electric circuits, Explain the Schematic ...

Explain the Schematic Diagrams of Electric Circuits Since figuring out what is happening in a circuit depends upon the way the elements are connected, one of the first hurdles

Determine the vertical reaction and the reaction moment, A load of P57 kN i...

A load of P57 kN is being hoisted at a constant speed by the motor, M which has a weight of 0.5kN. The beam has a weight of P58 N/m. Assume that the hoisting has stopped at the pos

Nuclear, how proton electron hypothesis is rejectrd on the basis of nuclear...

how proton electron hypothesis is rejectrd on the basis of nuclear magnetic dipole moment?

Isothermal process, In an isothermal process, the temperature of body alway...

In an isothermal process, the temperature of body always same throughout the process. As the internal energy of a system depends only on its temperature, thus there is no modificat

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