Problem

Problem

Calculate angular width of central maxima if λ=6000 A˚\lambda = 6000 \text{ \AA}, a=18×10−5 cma = 18 \times 10^{-5} \text{ cm}: (a) 20∘20^\circ (b) 40∘40^\circ (c) 30∘30^\circ (d) 260∘260^\circ

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