FIX THIS:The distance between the slits in young's double slit experiment is 0.25cm. Interference fringes are formed on a screen placed at a distance of 100cm from slits. The distance of the third dark fringe from the central bright fringe is 0...59cm. What is the wavelength of the incident light?
Correct answer: B. 590nm
- A. 390nm
- B. 590nm
- C. 690nm
- D. 790nm
- E. 990nm
Explanation
Given:Distance between the slits (d) = 0.25 cm = 0.0025 mDistance to the screen (D) = 100 cm = 1 mDistance of the third dark fringe (y3) = 0.59 cm = 0.0059 mFor dark fringes in Young's experiment, the position ym is given by:ym=(m+1/2)λD/dλ=y3*d/(m+1/2)Dλ=0.0000059m=590nm
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
Diffraction is the name given to the:
In Young's Double Slit Experiment, slit separation x = 0.05 cm, the distance between screen and slit D = 200 cm, fringes separation x = 0.13 cm, then the wavelength 'λ' of light is:
Critical angle is the angle of incidence in the denser medium for which the angle of refraction in the rarer medium is equal to:
The ratio of the angles subtended by the image as seen through the optical device to that subtended by the object at the unaided eye is known as:
At points where the displacements of two waves cancel each other's effect. the path difference is an odd integral multiple of half the wavelength. This effect is known as:
When a light ray passes through a small opening, the longer wave length of the red colour as compared to shorter wavelength of violet colour will