Question:
Young's double slit experiment gives interference fringes of width 0.3 mm. A thin glass plate made of material of refractive index 1.5 is kept in the path of light from one of the slits, then the fringe width becomes
Young's double slit experiment gives interference fringes of width 0.3 mm. A thin glass plate made of material of refractive index 1.5 is kept in the path of light from one of the slits, then the fringe width becomes
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Glass plates cause a pattern shift, but they do NOT change the width of the fringes.
Updated On: Apr 10, 2026
- zero
- 0.3 mm
- 0.45 mm
- 0.15 mm
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The Correct Option is B
Solution and Explanation
Step 1: Effect of Plate
Introducing a glass plate shifts the entire fringe pattern.
Step 2: Fringe Width Independence
Fringe width $\beta = \lambda D / d$ depends on wavelength, slit separation, and screen distance.
Step 3: Conclusion
Since these parameters do not change when the plate is added, the fringe width remains unchanged at 0.3 mm.
Final Answer: (b)
Introducing a glass plate shifts the entire fringe pattern.
Step 2: Fringe Width Independence
Fringe width $\beta = \lambda D / d$ depends on wavelength, slit separation, and screen distance.
Step 3: Conclusion
Since these parameters do not change when the plate is added, the fringe width remains unchanged at 0.3 mm.
Final Answer: (b)
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