13. 14. Consider the following properties of light: I rectilinear propagation ll. reection Ill. refraction IV. diffraction V. partial reection-refraction Which of these properties did Huygens have trouble explaining with his theory of light? a. I only b. IV only c. l and IV only d I and V only Monochromatic light coming from the left passes through a slit 8 and then falls on a metal sheet with two slits B and C as shown below. The slits are the same width. The light then falls on a screen. Distance {cl-n: The wavelength of the light is closest to (a) 1.5 x105 cm (lo) 4.5 x105 cm (c) 5.0 x105 cm (d) ?.5 x105 cm (e) 15x10'5 cm 15. Waves are produced by two point sources 81 and 32 vibrating in phase. P is a point on the third nodal line; the path difference S1P SEP is 5.0 cm. The wavelength of the waves is (a) 1.4 cm (b) 1.? cm (c) 2.0 cm (d) 2.5 cm (e) 3.3 cm 16. A single slit is illuminated by parallel light and a diffraction pattern is formed on a screen some distance away. Which one of the following diagrams best represents the intensity distribution across the screen? MAM .. .1 l l l. . maid... \"Mildly: 1?. Which one of the following is the correct unit for electrical potential difference? (a) Ns (b) m (c) Jrc (d) crs (e) JrA