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The width of one of the two slits in Young's double slit experiment is d while that of the other slit is xd. If the ratio of the maximum to the minimum intensity in the interference pattern on the screen is 9 : 4 then what is the value of x?
(Assume that the field strength varies according to the slit width.)

Asked in JEE Main 23rd Jan 2nd Shift 2025 · Intensity and coherent sources

• (1) 4
• (2) 5
• (3) 3
• (4) 2

Step-by-step solution

Why the other options are wrong

• (1) Arithmetic slip while solving (x+1)/(x-1) = 3/2.
• (3) Takes x/1 = 9/3 from the numerator alone.
• (4) Uses (x+1)/(x-1) = 3/1.

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