
What changes occur if the monochromatic light used in Young’s double-slit experiment is replaced by white light?
\[\left( A \right)\]Only the central fringe is white and all other fringes are observed colored.
\[\left( B \right)\]No fringes are observed.
\[\left( C \right)\]All the bright fringe becomes white.
\[\left( D \right)\]All the bright fringes are colored between violet and red.
Answer
422.3k+ views
Hint: To answer this question we should know Young’s double-slit experiment. Don’t worry if you don’t know about this. We will let you know through this question and will explain the reason behind the central fringe which becomes white.
Answer White light consists of waves of innumerable wavelengths ranging from violet to red color. So if monochromatic light in Young’s double-slit experiment is replaced by white light, then the waves of every wavelength form their separate interference patterns.

The resultant impact of these patterns is obtained on the screen. The path distinction between waves ranging from \[{S_1}\]and \[{S_2}\]at the location \[R\] of the central fringe is zero that is for the point \[R\] of the screen so the path difference will be zero.
Hence the waves of all colors reach a middle point \[R\] in the same phase. So the central fringe is white. As the fringe dimension that is the wavelength will increase so as colors denoted by VIBGYOR so on either aspect of it some colored fringes are obtained in the order of color VIBGYOR. That's the violet fringe seems first and therefore, the red in the last. When this the fringes of many colors overlap at every purpose of the screen then the screen seems uniformly illuminated. Thus, if we tend to use white light in place of monochromatic light the central fringe is white, containing on either aspect several colored fringes in order VIBGYOR and therefore, the remaining screen seems uniformly illuminated.
Therefore the \[Option{\text{ A}}\]will be the right choice as only the central fringe is white and all other fringes are observed colored.
Notes: Young’s double-slit experiment uses two coherent sources of light placed at a little distance apart, usually, solely orders of magnitude bigger than the wavelength of light is used. Young’s double-slit experiment helped in understanding the wave theory of light.
Answer White light consists of waves of innumerable wavelengths ranging from violet to red color. So if monochromatic light in Young’s double-slit experiment is replaced by white light, then the waves of every wavelength form their separate interference patterns.

The resultant impact of these patterns is obtained on the screen. The path distinction between waves ranging from \[{S_1}\]and \[{S_2}\]at the location \[R\] of the central fringe is zero that is for the point \[R\] of the screen so the path difference will be zero.
Hence the waves of all colors reach a middle point \[R\] in the same phase. So the central fringe is white. As the fringe dimension that is the wavelength will increase so as colors denoted by VIBGYOR so on either aspect of it some colored fringes are obtained in the order of color VIBGYOR. That's the violet fringe seems first and therefore, the red in the last. When this the fringes of many colors overlap at every purpose of the screen then the screen seems uniformly illuminated. Thus, if we tend to use white light in place of monochromatic light the central fringe is white, containing on either aspect several colored fringes in order VIBGYOR and therefore, the remaining screen seems uniformly illuminated.
Therefore the \[Option{\text{ A}}\]will be the right choice as only the central fringe is white and all other fringes are observed colored.
Notes: Young’s double-slit experiment uses two coherent sources of light placed at a little distance apart, usually, solely orders of magnitude bigger than the wavelength of light is used. Young’s double-slit experiment helped in understanding the wave theory of light.
Recently Updated Pages
Wheatstone Bridge - Working Principle, Formula, Derivation, Application

Young's Double Slit Experiment Step by Step Derivation

JEE Main 2023 (April 8th Shift 2) Physics Question Paper with Answer Key

JEE Main 2023 (January 30th Shift 2) Maths Question Paper with Answer Key

JEE Main 2022 (July 25th Shift 2) Physics Question Paper with Answer Key

Classification of Elements and Periodicity in Properties Chapter For JEE Main Chemistry

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility & More

JEE Main Login 2045: Step-by-Step Instructions and Details

JEE Main Exam Marking Scheme: Detailed Breakdown of Marks and Negative Marking

JEE Main 2023 January 24 Shift 2 Question Paper with Answer Keys & Solutions

JEE Mains 2025 Correction Window Date (Out) – Check Procedure and Fees Here!

JEE Main Participating Colleges 2024 - A Complete List of Top Colleges

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

JEE Advanced 2025: Dates, Registration, Syllabus, Eligibility Criteria and More

Learn About Angle Of Deviation In Prism: JEE Main Physics 2025

JEE Main 2025: Conversion of Galvanometer Into Ammeter And Voltmeter in Physics

Dual Nature of Radiation and Matter Class 12 Notes: CBSE Physics Chapter 11

Electric field due to uniformly charged sphere class 12 physics JEE_Main
