Calculate angular width of central maxima lambda - 6000 mathring A- a - 18times10-5- cm - 28-4-038-9-030-0260-0

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Calculate angular width of central maxima if $λ = 6000 ˚ A, a = 18 \times 10^{- 5} c m$ :
${28.4}^{0}$
${38.9}^{0}$
$30^{0}$
$260^{0}$

{28.4}^{0}

{38.9}^{0}

30^{0}

260^{0}

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Calculate angular width of central maxima if λ=6000˚A,a=18×10−5cm : 28.4038.903002600

Calculate angular width of central maxima if $λ = 6000 ˚ A, a = 18 \times 10^{- 5} c m$ :
${28.4}^{0}$
${38.9}^{0}$
$30^{0}$
$260^{0}$