A Slit of width 12 10-7 m is illuminated by light of wavelength 6000 Å . The angular width of the central maxima … (A) 30° (B)…
Answers:
The correct option is (B) 60°.
Explanation:
If θ is angular position of first minimum then sin θ = (λ/a)
here λ = 6000 Å & a = 12 × 10–7 m
sin θ = 500 × 10–3
θ = sin–1(0.5) = 30° angular width of central maximum = Wθ = 2θ = 2 × 30° = 60°.