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

Determine the efficiency of the transformer, A 400kVA transformer has a pri...

A 400kVA transformer has a primary winding resistance of 0.5Ω and a secondary winding resistance of 0.001Ω . The iron loss is 2.5kW and the primary and secondary voltages are

Explain about soft iron armatur, A force of 2.5kN is needed to lift a load....

A force of 2.5kN is needed to lift a load. How much work is done if the load is lifted by 500cm? An electromagnet exerts a force of 12N and moves a soft iron armature by a dist

Blackbody, For a blackbody, the frequency at which maximum energy is emitte...

For a blackbody, the frequency at which maximum energy is emitted is 3 x 10 13 Hz: A.  Give a wavenumber for the wavelength of the infrared emission? B.  What is the tempera

Wave, application of huygen''principle

application of huygen''principle

Couple, state the conditions under which two forces form a couple and give ...

state the conditions under which two forces form a couple and give an example of couple

What does the x represent in potential energy?, In an expression ½kx2 for t...

In an expression ½kx2 for the potential energy accumulates in the spring what does the x represent?         Answer: Quite frequently we consider there to be an object at

Can you put any amount of light into a fiber optic, Can you put any amount ...

Can you put any amount of light into a fiber optic? It is one of the standard fallacies of the industry. The system required to put a sizeable amount of light in a fiber optic

Equilibrium, what is the effect of torque and equilibrium on taps, doors,ha...

what is the effect of torque and equilibrium on taps, doors,handle bars and bicycles??

Damping coefficient, what is the physical significance of damping coefficie...

what is the physical significance of damping coefficient?

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