In an interference experiment monochromatic light is replaced by white light, we will see:a)uniform darkness on the screenb)a few coloured bands and then uniform illuminationc)equally spaced white and dark bandsd)uniform illumination on the screenCorrect answer is option 'B'. Can you explain this answer?

Question

In an interference experiment monochromatic light is replaced by white light, we will see:&#8203;a)uniform darkness on the screenb)a few coloured bands and then uniform illuminationc)equally spaced white and dark bandsd)uniform illumination on the screenCorrect answer is option 'B'. Can you explain this answer?

Answer

Therefore if monochromatic light in Young's interference experiment is replaced by white light, then the waves of each wavelength form their separate interference patterns. The resultant effect of all these patterns is obtained on the screen. i.e., the waves of all colours reach at mid point M in same phase we will see​.a few coloured bands and then uniform illumination

Answer

**Interference Experiment with Monochromatic Light**

In an interference experiment with monochromatic light, a coherent beam of light of a single wavelength is used. This results in a well-defined pattern of alternating bright and dark fringes on the screen. The interference occurs due to the superposition of two or more waves that are in phase or out of phase.

**Interference Experiment with White Light**

When white light is used instead of monochromatic light in an interference experiment, several wavelengths of light are present simultaneously. Each wavelength produces its own set of interference fringes. As a result, we observe a few colored bands and then uniform illumination.

**Explanation**

When white light is incident on a double-slit or thin film, it gets split into multiple wavelengths or colors due to dispersion. Each wavelength then creates its own interference pattern. The constructive and destructive interference between the different wavelengths leads to the formation of colored fringes.

- Initially, we observe a few colored bands on the screen. These bands correspond to the wavelengths of light that constructively interfere with each other at specific angles.
- As we move away from the central maximum, the path difference between the interfering waves increases. This leads to a decrease in the intensity of the fringes.
- Beyond a certain point, the path difference becomes large enough that the interference between different wavelengths becomes random and no longer produces distinct fringes.
- At this point, the intensity of the light becomes uniform, resulting in uniform illumination on the screen.

**Conclusion**

In an interference experiment with white light, the initial observation of colored bands is followed by uniform illumination. This is because the interference between different wavelengths of light gradually becomes random, leading to the disappearance of the distinct interference fringes.

Answer

White light is made up of seven colors VIBGYOR. All the seven colors will show interference, we can treat each color separately as a monochromatic light and study their interference separately. Each light will have their bright and dark fringes separately but at y=0 i.e for a center, each lights bright fringe will coincide. Two or more lights may have their bright and dark Fringe together or bright for one and dark for others may coincide depending upon the situation.
Each light will have its dark and bright fringes independently, but each bright fringe light will coincide at y= 0, i.e. for a center.
It would describe the colors closest to the white central maximum as yellow (absence of blue) and magenta (absence of green). There is no 'farthest' fringe, but next one sees a band of cyan (absence of red). These are complementary colors of the primary ones.
It has to do with the pigments in our eyes. Cameras and displays try to match these with their RGB channels. Here is an image I made, using a camera without a lens, using a 20 μm slit in the lens cap.

Top Courses for Class 12View all

English Class 12

Chemistry Class 12

Physics Class 12

English Flamingo Class 12

Physical Education Class 12(XII) - Notes & Model Test Papers

Top Courses for Class 12

Top Courses for Class 12

Related Content

Schools

Competitive Examinations

Quick Access Links

Technical Exams