1.

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  -30° ≤ θ ≤ 30°  is: (1) 320 (2) 641 (3) 321 (4) 640 

Answer»

The correct option (2) 641   

Explanation:

dSinθ = nλ(θ = 30°) => n = 320

So, Number of maxima (Including central maxima) = 2n + 1 = 641



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