Choose the correct option for the following Assertion (A) and Reason (R).

Question

G1 Physics · Accepted Answer

For a single slit, minima satisfy a sinθ = mλ. The first minima around the central maximum correspond to m = +1 and m = −1. Hence, on a distant screen, y(+1) ≈ +λD ÷ a, y(−1) ≈ −λD ÷ a. Therefore the central maximum width is W(central) ≈ 2λD ÷ a. Consecutive minima on one side are separated approximately by λD ÷ a. Hence a secondary maximum occupies approximately one such interval. Therefore the central maximum is approximately twice as wide as a secondary maximum. Both Assertion and Reason are…