(Q29-Q30) A double-slit interference pattern is observed on a screen 1.2 m behind two slits spaced 0.30 mm apart. Q29. What is the path-length difference from the two slits to fringe B on the screen in terms of wavelength λ? A. 0 B. 0.5A C. A D. 1.5A E. 2.0A F. 2.5X G. 3.02 H. none of the above Q30. What is the wavelength of the light, in nm, if the distance between fringes A and B is 0.40 cm? A. 200 nm 300 nm B. C. 400 nm D. 500 nm E. 600 nm F. 800 nm G. 1000 nm H. none of the above bright fringe central fringe dark fringe -B

(Q29-Q30) A double-slit interference pattern is observed on a screen 1.2 m behind two slits spaced 0.30 mm apart. Q29. What is the path-length difference from the two slits to fringe B on the screen in terms of wavelength λ? A. 0 B. 0.5A C. A D. 1.5A E. 2.0A F. 2.5X G. 3.02 H. none of the above Q30. What is the wavelength of the light, in nm, if the distance between fringes A and B is 0.40 cm? A. 200 nm 300 nm B. C. 400 nm D. 500 nm E. 600 nm F. 800 nm G. 1000 nm H. none of the above bright fringe central fringe dark fringe -B