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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.


Assertion : In Young’s double slit experiment if wavelength of incident monochromatic light is just doubled, the number of bright fringes on the screen will increase.


Reason : Maximum number of bright fringe on the screen is inversely proportional to the wavelength of light used

  • a)
    If both the Assertion and Reason are incorrect.

  • b)
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

  • c)
    If the Assertion is correct but Reason is incorrect.

  • d)
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion. 

Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Directions: These questions consist of two statements, each printed as...
Assertion: In Young’s double slit experiment, if the wavelength of incident monochromatic light is doubled, the number of bright fringes on the screen will increase.
Reason: The maximum number of bright fringes on the screen is inversely proportional to the wavelength of light used.

To understand why the correct answer is option 'A', let's break down the Assertion and Reason separately and then see how they relate to each other.

Assertion: In Young’s double slit experiment, if the wavelength of incident monochromatic light is doubled, the number of bright fringes on the screen will increase.

In Young's double-slit experiment, a beam of monochromatic light is passed through two slits, creating an interference pattern on a screen placed behind the slits. The interference pattern consists of alternating bright and dark fringes.

When the wavelength of the incident light is doubled, it means that the light waves are becoming longer. The distance between the bright fringes in the interference pattern is determined by the wavelength of light. A longer wavelength means a larger distance between the fringes.

So, if the wavelength is doubled, the distance between the bright fringes will also double. As a result, the number of bright fringes that can fit on the screen will increase. Therefore, the assertion is correct.

Reason: The maximum number of bright fringes on the screen is inversely proportional to the wavelength of light used.

The reason states that the maximum number of bright fringes on the screen is inversely proportional to the wavelength of light used. In other words, as the wavelength increases, the number of bright fringes decreases.

This reason is correct because the distance between the bright fringes is directly related to the wavelength of light. The formula for calculating the distance between the fringes is given by:

Distance between fringes = (wavelength * distance between slits) / (distance to the screen)

As the wavelength increases, the distance between fringes increases, and therefore, the number of fringes that can fit on the screen decreases. This is because the screen has a limited size, and as the distance between fringes increases, fewer fringes can fit within that limited space.

Therefore, the reason is a correct explanation of the assertion.

Conclusion:

Both the assertion and the reason are correct, and the reason is a correct explanation of the assertion. Hence, the correct answer is option 'A'.
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Community Answer
Directions: These questions consist of two statements, each printed as...
Wavelength is inversely proportional to the number of fringes, hence by doubling the wavelength the number of fringes decreases. Hence Assertion and reason are false.
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Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : In Young’s double slit experiment if wavelength of incident monochromatic light is just doubled, the number of bright fringes on the screen will increase.Reason : Maximum number of bright fringe on the screen is inversely proportional to the wavelength of light useda)If both the Assertion and Reason are incorrect.b)If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.c)If the Assertion is correct but Reason is incorrect.d)If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.Correct answer is option 'A'. 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 Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : In Young’s double slit experiment if wavelength of incident monochromatic light is just doubled, the number of bright fringes on the screen will increase.Reason : Maximum number of bright fringe on the screen is inversely proportional to the wavelength of light useda)If both the Assertion and Reason are incorrect.b)If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.c)If the Assertion is correct but Reason is incorrect.d)If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.Correct answer is option 'A'. 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 Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : In Young’s double slit experiment if wavelength of incident monochromatic light is just doubled, the number of bright fringes on the screen will increase.Reason : Maximum number of bright fringe on the screen is inversely proportional to the wavelength of light useda)If both the Assertion and Reason are incorrect.b)If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.c)If the Assertion is correct but Reason is incorrect.d)If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.Correct answer is option 'A'. Can you explain this answer?.
Solutions for Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.Assertion : In Young’s double slit experiment if wavelength of incident monochromatic light is just doubled, the number of bright fringes on the screen will increase.Reason : Maximum number of bright fringe on the screen is inversely proportional to the wavelength of light useda)If both the Assertion and Reason are incorrect.b)If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.c)If the Assertion is correct but Reason is incorrect.d)If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
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