Physics Exam > Physics Questions > It is necessary to coat a glass lens with a n...
Start Learning for Free
It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating is λ, the best choice is a layer of material having an index of refraction between those of glass & air and a thickness of what fraction of λ ?
Correct answer is '0.25'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
It is necessary to coat a glass lens with a non reflecting layer if th...
In order for the thin film layer to be non reflecting, it must cancel the reflected wavelength as in a destructive interference the change in wavelength as
Since, the wave changes phase by π at the interface below air and the coating, and again at the second interface below coating and glass
(Assume nair < ncoating < nglass). Destructive interference is thus given by a half integer wavelength change mλ/2 where the smallest change is
The correct answer is: 0.25
Since, the wave changes phase by π at the interface below air and the coating, and again at the second interface below coating and glass
(Assume nair < ncoating < nglass). Destructive interference is thus given by a half integer wavelength change mλ/2 where the smallest change is
The correct answer is: 0.25
Most Upvoted Answer
It is necessary to coat a glass lens with a non reflecting layer if th...
Comparable to the thickness of the coating.
When light passes through a medium with a different refractive index, some of it is reflected at the interface between the two materials. This reflection can reduce the amount of light transmitted through the lens and cause unwanted reflections.
By applying a non-reflecting coating on the lens, the refractive index of the coating can be chosen in such a way that the reflection of light at the interface is minimized. This is achieved by ensuring that the thickness of the coating is equal to a quarter-wavelength of the incident light.
At this thickness, the reflected waves from the front and back surfaces of the coating interfere destructively, resulting in minimal reflection. This allows more light to be transmitted through the lens, improving its efficiency and reducing unwanted reflections.
Therefore, if the wavelength of the light in the coating is comparable to the thickness of the coating, it is necessary to coat the glass lens with a non-reflecting layer to minimize reflection and optimize light transmission.
When light passes through a medium with a different refractive index, some of it is reflected at the interface between the two materials. This reflection can reduce the amount of light transmitted through the lens and cause unwanted reflections.
By applying a non-reflecting coating on the lens, the refractive index of the coating can be chosen in such a way that the reflection of light at the interface is minimized. This is achieved by ensuring that the thickness of the coating is equal to a quarter-wavelength of the incident light.
At this thickness, the reflected waves from the front and back surfaces of the coating interfere destructively, resulting in minimal reflection. This allows more light to be transmitted through the lens, improving its efficiency and reducing unwanted reflections.
Therefore, if the wavelength of the light in the coating is comparable to the thickness of the coating, it is necessary to coat the glass lens with a non-reflecting layer to minimize reflection and optimize light transmission.
|
Explore Courses for Physics exam
|
|
Similar Physics Doubts
It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer?
Question Description
It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer?.
It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer?.
Solutions for It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer? in English & in Hindi are available as part of our courses for Physics.
Download more important topics, notes, lectures and mock test series for Physics Exam by signing up for free.
Here you can find the meaning of It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer?, a detailed solution for It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer? has been provided alongside types of It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice It is necessary to coat a glass lens with a non reflecting layer if the wavelength of the light in the coating isλ,the best choice is a layer of material having an index ofrefraction between those of glass & air and a thickness of what fraction of λ ?Correct answer is '0.25'. Can you explain this answer? tests, examples and also practice Physics tests.
|
|
Explore Courses for Physics exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup