7. In a Young's double slit experiment with sodium light, slits are 0.589 m apart. The angular separation of the third maximum from the central maximum will be (given λ = 589 nm):
(1) sin–1 (0.33 × 108)
(2) sin–1 (0.33 × 10–6)
(3) sin–1 (3 × 10–8)
(4) sin–1 (3 × 10–6)
