(a) Coherent light of wavelength 540nm passes through a slit 2mm wide. What is the angle (in radians) of the second (m = 2) diffraction minimum? (b) Coherent light is

diffracted by a single slit which is 8um wide. The central maximum of the diffracted light has a width of 2cm when it falls on a screen 0.25m behind the slit. Determine the wavelength of the incident light. (a) Two slits on a screen placed 0.3mm apart are 0.90m from a second screen. The slits are illuminated by coherent light of wavelength 600nm. What is the distance between the fringes above and below the central maximum of this interference pattern where m = 2? (c) If the minimum intensity of the signal to be received at a distance of 100m from a domestic radio transmitter is 1uWm2, calculate the required transmitter power.