Physics · Interference: Young's double-slit experiment and expression for fringe width, coherent sources and sustained interference of light
If yellow light emitted by sodium lamp in Young's double slit experiment is repl
If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by monochromatic blue light of same intensity keeping other parameters constant the new fringe width will :
- A. Remain unchanged
- B. Increase
- C. Decrease
- D. Can't be predicted
Step-by-step solution
Fringe width in Young's double slit experiment is given by β = λD/d, where λ is the wavelength, D is the distance to the screen, and d is the slit separation. Blue light has a shorter wavelength than yellow light. Since other parameters remain constant, a decrease in λ leads to a decrease in fringe width.
Related MCQs
- In Young's experiment with white light, the central fringe is white. If now a transparent film is introduced in the upper beam coming from t…
- The condition for constructive interference is path difference should be equal to :…
- Initially interference is observed with the entire experimental set up inside a chamber filled with air, Now the chamber is evacuated. With …
- Two monochromatic (wavelength and coherent source of electromagnetic waves are placed on the -axis at the point \) and . \) A detector moves…
- Two coherent monochromatic light beams of intensities and are superposed. The maximum and minimum possible intensities in the resulting beam…