Yellow light (λ = 6000 Å) illuminates a single slit of width 1 × 10⁻⁴ m. Calculate (i) the distance between two dark lines on either side of central maximum, in the diffraction pattern observed on a screen kept 1·5 m away from the slit, and (ii) the angular spread of the first minimum.

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TextYoung's Double Slit ExperimentDiffraction of Light at a Single SlitCBSE PYQ

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A beam of light consisting of a known wavelength 520 nm and an unknown wavelength λ, used in Young's double slit experiment produces two interference patterns such that the fourth bright fringe of unknown wavelength coincides with the fifth bright fringe of known wavelength. Find the value of λ.

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Two waves, each of amplitude 'a' and frequency 'ω' emanating from two coherent sources of light superpose at a point. If the phase difference between the two waves is φ, obtain an expression for the resultant intensity at that point.

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