Allocated time: 1 hour and 15 minutes MULTIPLE CHOICE (2 x 10 = 20 points) 1) When light travels from air into water, 11 change. . . cy a a lts velocrty, wavelength and frequen elength d0 ) but its frequency am; :VVZZelength 0 not Change. b) its velocity changeS, . . 0) its frequency changes, bUt 1'5 \"oaty an 5 frequency does 110 d) its velocity and wavelength change, but it um of 600 nm enters a liqui 2) Light having a wavelength in vacu ght? this liquid, what is the wavelength of the li a) 1200 nm b) 600 mm c) 300 nm d) 150 nm e laser light of different to US - u observe that this 3) In a double-slit interference experiment you are asked _ Y wavelengths and determine the separation between adjacent maXIma. 0 separation is greatest when you illuminate the double slit With a) blue light. (500 nm) b) green light. (550 nm) c) yellow light. (575 nm) (1) red light. (625 nm) en. Assuming the angles involved 4) A single-slit diffraction pattern is formed on a distant scre ' change if the are small, by what factor will the width of the central bright spot on the screen slit width is doubled? a) It will be cut to one-quarter its original size. b) It will be cut in half. c) It will double. d) It will become eight times as large. ' es a glass slab at an angle of incidence less than 90. 5) A beam of light traveling in air st es the beam of light do? (There could be more than After entering the glass slab, what do one correct choice.) a) It follows the normal to the glass slab. b) It bends away from the normal at the point of contact. c) It bends closer to the normal at the point of contact. d) It slows down. 6) Calculate the critical angle for a light ray traveling from glass (n=1 .5) to air (n=l) a) 133 b) 485 c) 3 2 .2 o d) 41.8