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Using the expression 2d sin θ = λ , one calculates the values of d by measuring the corresponding angles θ in the range 0 to 90º. The wavelength λ is exactly known and the error in θ is constant for all values of θ . As θ increases from 0º,

1. the absolute error in d remains constant
2. the absolute error in d increases
3. the fractional error in d remains constant
4. the fractional error in d decreases

Correct answer: the fractional error in d decreases

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