A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young’s double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it is observed that the third bright fringe of known light coincides with the 4th bright fringe of the unknown light. From this data, the wavelength of the unknown light is
393.4 nm
885.0 nm
442.5 nm
776.8 nm
As we learnt in
Fringe Width -
- wherein
Distance of
Maxima
Distance of
maxima
3rd bright fringe of known light coincides with the 4th bright fringe of the unknown light.
Correct option is 3.
Option 1)
393.4 nm
This is an incorrect option.
Option 2)
885.0 nm
This is an incorrect option.
Option 3)
442.5 nm
This is the correct option.
Option 4)
776.8 nm
This is an incorrect option.
Study 40% syllabus and score up to 100% marks in JEE