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Question

Light of wavelength λ is incident on a slit of width d. The resulting diffraction pattern is observed on a screen at a distance D. The linear width of the principal maxima is then equal to the width of the slit if D equals

A
d2λ
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B
3λd
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C
d22λ
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D
2λ27d
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Solution

The correct option is C d22λ
For the single slit diffraction,
Linear width of central maxima is
2Dλd=d
D=d22λ

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