JEE Advanced 2026 Physics question
In a single slit diffraction experiment, a slit of width is used to measure the wavelength of a monochromatic light source. In the diffraction pattern, the angular distance between the central maximum and first minimum is measured to be . The value of the fractional error in the measurement of wavelength is:
[Given: ]
Answer: 0.46
Solution
**Working formula.** The first minimum of a single slit of width satisfies , so
λ=aθ .
**Error propagation.** Taking logarithms and differentiating,
=+θ Δθ .
**Slit-width term.**
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