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Class 12 Exam  >  Class 12 Questions  >  In an interference experiment monochromatic l... Start Learning for Free
In an interference experiment monochromatic light is replaced by white light, we will see:​
  • a)
    uniform darkness on the screen
  • b)
    a few coloured bands and then uniform illumination
  • c)
    equally spaced white and dark bands
  • d)
    uniform illumination on the screen
Correct answer is option 'B'. Can you explain this answer?
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In an interference experiment monochromatic light is replaced by white...
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
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In an interference experiment monochromatic light is replaced by white...
**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.
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Read the following text and answer the following questions on the basis of the same:In one of his experiments on interference, August Jean Fresnel used a biprism to induce interference between two beams. He split a diverging beam of light into two parts by using the biprism to refract them. This resulted in two split beams which acted as if they were from two coherent sources and which therefore interfered with each other.A Fresnel Biprism is a thin double prism placed base to base and have very small refracting angle ( 0.5°). This is equivalent to a single prism with one of its angle nearly 179° and other two of 0.5° each.In Young’s double Slits experiment, a single source is split in two coherent sources. For the Young’s slits experiment, we must approximate that the slits act as point sources. This however is not the case, since the slits have finite width. In this way, it gives rise to unwanted diffraction effects that causes errors.The Fresnel biprism experiment overcomes this problem.A Fresnel biprism is a variation of Young’s Slits experiment. When monochromatic light through a narrow slit falls on biprism that divides it into two components. One of these component is refracted from upper portion of biprism and the other one refracted through lower portion. Two virtual coherent sources formed from the original source. In this case, two virtual coherent sources are point sources and replace slits in Young’s experiment.Q. Which problem of Young’s double slit experiment is overcome by Fresnel biprism?

Read the following text and answer the following questions on the basis of the same:In one of his experiments on interference, August Jean Fresnel used a biprism to induce interference between two beams. He split a diverging beam of light into two parts by using the biprism to refract them. This resulted in two split beams which acted as if they were from two coherent sources and which therefore interfered with each other.A Fresnel Biprism is a thin double prism placed base to base and have very small refracting angle ( 0.5°). This is equivalent to a single prism with one of its angle nearly 179° and other two of 0.5° each.In Young’s double Slits experiment, a single source is split in two coherent sources. For the Young’s slits experiment, we must approximate that the slits act as point sources. This however is not the case, since the slits have finite width. In this way, it gives rise to unwanted diffraction effects that causes errors.The Fresnel biprism experiment overcomes this problem.A Fresnel biprism is a variation of Young’s Slits experiment. When monochromatic light through a narrow slit falls on biprism that divides it into two components. One of these component is refracted from upper portion of biprism and the other one refracted through lower portion. Two virtual coherent sources formed from the original source. In this case, two virtual coherent sources are point sources and replace slits in Young’s experiment.Q. Base angles of Fresnel biprism are

Read the following text and answer the following questions on the basis of the same:In one of his experiments on interference, August Jean Fresnel used a biprism to induce interference between two beams. He split a diverging beam of light into two parts by using the biprism to refract them. This resulted in two split beams which acted as if they were from two coherent sources and which therefore interfered with each other.A Fresnel Biprism is a thin double prism placed base to base and have very small refracting angle ( 0.5°). This is equivalent to a single prism with one of its angle nearly 179° and other two of 0.5° each.In Young’s double Slits experiment, a single source is split in two coherent sources. For the Young’s slits experiment, we must approximate that the slits act as point sources. This however is not the case, since the slits have finite width. In this way, it gives rise to unwanted diffraction effects that causes errors.The Fresnel biprism experiment overcomes this problem.A Fresnel biprism is a variation of Young’s Slits experiment. When monochromatic light through a narrow slit falls on biprism that divides it into two components. One of these component is refracted from upper portion of biprism and the other one refracted through lower portion. Two virtual coherent sources formed from the original source. In this case, two virtual coherent sources are point sources and replace slits in Young’s experiment.Q. Fresnel biprism produces

Read the following text and answer the following questions on the basis of the same:In one of his experiments on interference, August Jean Fresnel used a biprism to induce interference between two beams. He split a diverging beam of light into two parts by using the biprism to refract them. This resulted in two split beams which acted as if they were from two coherent sources and which therefore interfered with each other.A Fresnel Biprism is a thin double prism placed base to base and have very small refracting angle ( 0.5°). This is equivalent to a single prism with one of its angle nearly 179° and other two of 0.5° each.In Young’s double Slits experiment, a single source is split in two coherent sources. For the Young’s slits experiment, we must approximate that the slits act as point sources. This however is not the case, since the slits have finite width. In this way, it gives rise to unwanted diffraction effects that causes errors.The Fresnel biprism experiment overcomes this problem.A Fresnel biprism is a variation of Young’s Slits experiment. When monochromatic light through a narrow slit falls on biprism that divides it into two components. One of these component is refracted from upper portion of biprism and the other one refracted through lower portion. Two virtual coherent sources formed from the original source. In this case, two virtual coherent sources are point sources and replace slits in Young’s experiment.Q. The Fresnel biprism is

Read the following text and answer the following questions on the basis of the same: In one of his experiments on interference, August Jean Fresnel used a biprism to induce interference between two beams. He split a diverging beam of light into two parts by using the biprism to refract them. This resulted in two split beams which acted as if they were from two coherent sources and which therefore interfered with each other. A Fresnel Biprism is a thin double prism placed base to base and have very small refracting angle ( 0.5°). This is equivalent to a single prism with one of its angle nearly 179° and other two of 0.5° each. In Young’s double Slits experiment, a single source is split in two coherent sources. For the Young’s slits experiment, we must approximate that the slits act as point sources. This however is not the case, since the slits have finite width. In this way, it gives rise to unwanted diffraction effects that causes errors. The Fresnel biprism experiment overcomes this problem. A Fresnel biprism is a variation of Young’s Slits experiment. When monochromatic light through a narrow slit falls on biprism that divides it into two components. One of these component is refracted from upper portion of biprism and the other one refracted through lower portion. Two virtual coherent sources formed from the original source. In this case, two virtual coherent sources are point sources and replace slits in Young’s experiment. Q. What is the difference between the coherent sources produced by Young’s double slit arrangement and Fresnel biprism?

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?
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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? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about 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? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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?.
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