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Class 12 Exam  >  Class 12 Questions  >  The change in diffraction pattern of a single... Start Learning for Free
The change in diffraction pattern of a single slit, when the monochromatic source of light is replaced by a source of white light will be
  • a)
    Diffracted image is not clear
  • b)
    Diffracted image gets dispersed into constituent colours of white light
  • c)
    The image of the slit becomes infinitely wide
  • d)
    Clear colourful fringe pattern
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
The change in diffraction pattern of a single slit, when the monochrom...
  • When a source of white light is used instead of a monochromatic source, the diffracted image of the slit gets dispersed into constituent colours of white light.
  • The central maximum will be white and on either side of the central maximum, there will be coloured fringes.
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The change in diffraction pattern of a single slit, when the monochrom...
When a source of white light is used instead of monochromatic source, the diffracted image of the slit gets dispersed into constituent colours of white light.The central maximum will be white and on either side of the central maximum there will be coloured fringes

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The change in diffraction pattern of a single slit, when the monochrom...
Introduction to Diffraction Patterns
Diffraction refers to the bending and spreading of waves when they encounter an obstacle or a slit. The pattern produced by a single slit using monochromatic light typically consists of a central bright fringe, flanked by alternating dark and bright fringes.
Change in Light Source
When the monochromatic light source is replaced with white light, the behavior of the diffraction pattern changes significantly.
Reasons for Dispersion
- White Light Composition: White light is composed of multiple wavelengths (colors) ranging from red to violet.
- Different Wavelengths, Different Angles: Each wavelength will diffract at slightly different angles due to their varying sizes. This causes the light to spread out.
Effect on the Diffraction Pattern
- Dispersion of Colors: Instead of a clear, sharp diffraction pattern, the white light creates a spectrum-like effect. The central bright fringe will still appear, but it will be surrounded by a series of colored fringes rather than just dark and light bands.
- Loss of Clarity: The interplay of different colors results in a less distinct image of the slit, making it appear blurred or wider.
Conclusion
Thus, the correct answer is option 'B': "The diffracted image gets dispersed into constituent colours of white light." This phenomenon illustrates the wave nature of light and the impact of different wavelengths on diffraction patterns.
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Read the following text and answer the following questions on the basis of the same:Diffraction in a hall:A and B went to purchase a ticket of a music programme. But unfortunately only one ticket was left. They purchased the single ticket and decided that A would be in the hall during the 1st half and B during the 2nd half.Both of them reached the hall together. A entered the hall and found that the seat was behind a pillar which creates an obstacle. He was disappointed. He thought that he would not be able to hear the programme properly.B was waiting outside the closed door. The door was not fully closed. There was a little opening.But surprisingly, A could hear the music programme.This happened due to diffraction of sound.The fact we hear sounds around corners and around barriers involves both diffraction and reflection of sound.Diffraction in such cases helps the sound to "bend around" the obstacles.In fact, diffraction is more pronounced with longer wavelengths implies that we can hear low frequencies around obstacles better than high frequencies.B was outside the door. He could also hear the programme. But he noticed that when the door opening is comparatively less he could hear the programme even being little away from the door. This is because when the width of the opening is larger than the wavelength of the wave passing through the gap then it does not spread out much on the other side. But when the opening is smaller than the wavelength more diffraction occurs and the waves spread out greatly – with semicircular wavefront. The opening in this case functions as a localized source of sound.Q. Diffraction of sound takes place more when

The change in diffraction pattern of a single slit, when the monochromatic source of light is replaced by a source of white light will bea)Diffracted image is not clearb)Diffracted image gets dispersed into constituent colours of white lightc)The image of the slit becomes infinitely wided)Clear colourful fringe patternCorrect answer is option 'B'. Can you explain this answer?
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The change in diffraction pattern of a single slit, when the monochromatic source of light is replaced by a source of white light will bea)Diffracted image is not clearb)Diffracted image gets dispersed into constituent colours of white lightc)The image of the slit becomes infinitely wided)Clear colourful fringe patternCorrect 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 The change in diffraction pattern of a single slit, when the monochromatic source of light is replaced by a source of white light will bea)Diffracted image is not clearb)Diffracted image gets dispersed into constituent colours of white lightc)The image of the slit becomes infinitely wided)Clear colourful fringe patternCorrect 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 The change in diffraction pattern of a single slit, when the monochromatic source of light is replaced by a source of white light will bea)Diffracted image is not clearb)Diffracted image gets dispersed into constituent colours of white lightc)The image of the slit becomes infinitely wided)Clear colourful fringe patternCorrect answer is option 'B'. Can you explain this answer?.
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