When interference between thin films occurs, the path difference between two interfering rays is 2t. If 'n' is the refractive index of the medium, the bright circles are obtained when _ with m = 0, 1, 2, 3, ...
Correct answer: A. (2m + 1) λ = 4nt
- A. (2m + 1) λ = 4nt
- B. (2m + 1) λ = 2nt
- C. 2m = nt
- D. mλ = 2nt
Explanation
The explanation is given below:In thin film interference, bright circles would occur by constructive interference. Constructive interference is given by:2t = (m+½)λn, m = 0,1,2,3,...4t = (2m+1)λnt is the thickness of the medium.λn is the wavelength of light in the medium.λn = λ/nTherefore, for constructive interference:(2m + 1)λ = 4nt, m = 0,1,2,3,...n is the refractive index of the medium.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
Practise Optics
665 free Optics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 11 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Optics questions
The property of light, bending around obstacles and spreading of waves into the geometrical shadow of an obstacle is called _.
A camera of 6 cm focal length is used to photograph a distant scene. The distance from the lens to the image is approximately:
In an astronomical telescope, the lens called eyepiece forms an image of a distant object that is:
The light exhibits the phenomena of constructive interference under the situation when it is _ and _.
The film of oil on water shows color pattern when illuminated by white light due to:
Monochromatic light means the light having: