42. How did Young solve the problem of phase difference in the light sources for his double-slit experiment? (9.5) KAU 43. Name a property of light that the wave theory of light, as corroborated by Young's experiment, could not explain. (9.5) KU 44. How would the interference pattern in Young's experiment change if the two slits had a smaller separation? (9.5) KU 45. The index of refraction of a piece of glass is 1.5. Compare the frequency of a light wave as it travels through the glass to the frequency of the light wave as it travels through a vacuum. (10.1) ku 46. State the conditions that cause the formation of Newton's rings. (10.1) ku 47. Describe the effect on resolution of increasing the wavelength of light passing through the aperture of an optical instrument. (10.2) m 48. Describe what happens to the distance between maxima and minima in single-slit diffraction as the slit width decreases. (10.2)