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In an experiment of single slit diffraction pattern, first minimum for red light coincides with first maximum of some other wavelength. If wavelength of red light is 6600 Å, then wavelength of first maximum will be

Asked in JEE Main Online 2014 · Single slit diffraction

• (1) 3300 Å
• (2) 4400 Å
• (3) 5500 Å
• (4) 6600 Å

Step-by-step solution

Why the other options are wrong

• (1) Takes the first maximum at 2λ' instead of 3/2λ'.
• (3) Uses a ratio of 5/6 with no basis in the maxima condition.
• (4) Treats the first maximum like the first minimum, same wavelength.

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