Q140. Light of wavelength λ is incident on a slit. The first minima of the diffraction pattern is found to lie at a distance of 6 mm from the central maximum on a screen placed at a distance of 2 m from the slit. If the slit width is 0.2 mm, then the wavelength of the light used will be:Physics — NUST Mock 4 — Question 140 of 200A. 4000 Å B. 6000 Å C. 7000 Å D. 7400 Å Practice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →