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Using Young's double slit experiment, a monochromatic light of wavelength 5000 Å produces fringes of fringe width 0.5 mm. If another monochromatic light of wavelength 6000 Å is used and the separation between the slits is doubled, then the new fringe width will be

Asked in JEE Main 29th June 1st Shift 2022 · Fringe width and fringe position

• (1) 0.5 mm
• (2) 1.0 mm
• (3) 0.6 mm
• (4) 0.3 mm

Step-by-step solution

Why the other options are wrong

• (1) Ignores both changes.
• (2) Multiplies by 2 for the doubled slit separation instead of dividing, and ignores the wavelength change.
• (3) Scales for wavelength only, forgetting the doubled slit separation.

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