JEE Main 2019 Physics question
In a Young's double slit experiment, the slits are placed 0.320 mm apart. Light of wavelength λ = 500 nm is incident on the slits. The total number of bright fringes that are observed in the angular range −30º ≤ θ ≤ 30º is:
Answer: (B)
Solution
; orders −320 to +320 give 641 fringes.