1) Monochromatic light with wavelength 540nmpasses through a single slit 2.20?m wide and 2.30m from a screen.
Find the distance between the first- and second-order dark fringes on the screen. delta y=?
2) A meniscus lens is concave on one side and convex on the other.
Find the refractive power of a meniscus lens with n = 1.56 and curvature radius 29cm on the convex side and 48cm on the concave side. Answer is in diopters