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Shyam was performing a double slit experiment to determine wavelength of monochromatic light…
Shyam was performing a double slit experiment to determine wavelength of monochromatic light emitted by a laser. The examiner asked him some questions based on that experiment. Shyam answered those questions as per his understanding of the experiment.
State whether his answers are correct. If incorrect, write the correct answer.
(i)
Examiner: What is meant by fringe width?
Shyam: It is the distance between centres of a bright band and the adjacent dark band.
(ii)
Examiner: What happens to fringe width if blue light is replaced with red light?
Shyam: Fringe width increases.
(iii)
Examiner: What will happen to the interference pattern if one of the slits is closed?
Shyam: The screen will be uniformly illuminated.
Answer
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From ISC 2025 Improvement Physics Paper 1, question 15.