The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in young’s double-slit experiment is

- infinite
- five
- three
- zero

**Answer**

nλ = d sinθ

2nλ = 2d.sinθ

2d = 2λ given

2nλ = 2λ . sinθ

sin θ = n (n = 0, 1, 2, .... ∝)

**The correct option is A.**