26.A parallel light beam containing two wavelengths, 480 nm and 700 nm, strikes a plain piece of glass at an angle of incidence of 60o. The index of refraction of the glass is 1.4830 at 480 nm and 1.4760 at 700 nm. Determine the angle between the two beams in the glass.
a) 2.34 b) 0.196 c) 0.392 d) 35.7
27.Monochromatic light from a distant source is incident on two parallel narrow slits. After passing through the slits the light strikes a screen. What will be the nature of the pattern of light observed on the screen?
a)The screen will be most brightly illuminated at the center, with the intensity decreasing slowly and uniformly as you move outward from the center.
b)A series of alternating light and dark bands.
c)A rainbow of colored lines will be seen spreading out on either side of the center.
d)Two bright bands of light, one in line with each slit.
e)The screen will be uniformly illuminated except for two dark bands, one in line with each slit.
28.At the first maxima on either side of the central bright spot in a double-slit experiment, light from each opening arrives
a)in phase. b) 90o out of phase. c)180o out of phase. d) none of the above.
29.At the second maxima on either side of the central bright spot in a double-slit experiment, light from
a)each opening travels the same distance.
one opening travels twice as far as light from the other opening.
one opening travels one wavelength of light farther than light from the other opening.
d)one opening travels two wavelengths of light farther than light from the other opening.
30.In a diffraction experiment, light of 600 nm wavelength produces a first-order maximum 0.35 mm from the central maximum on a distant screen. A second monochromatic source produces a third-order maximum 0.87 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source?
a) 149 nm b) 1491 nm c) 49 nm d) 497 nm
31.A single slit, which is 0.05 mm wide, is illuminated by light of 550 nm wavelength. What is the angular separation between the first two minima on either side of the central maximum?
a) 0.315 b) 2.52 c) 0.63 d) 1.26
For a beam of light, the direction of polarization is defined as
a) the beam's direction of travel.
b)the direction of the electric field's vibration.
c)the direction of the magnetic field's vibration.
d)the direction that is mutually perpendicular to the electric and magnetic field vectors.
33.A polarizer (with its preferred direction rotated 30 to the vertical) is placed in a beam of unpolarized light of intensity 1. After passing through the polarizer, the beam's intensity is
a)0.250b) 0.500c) 0.866d) 0.750
34.Sunlight reflected from the surface of a lake
b)tends to be polarized with its electric field vector parallel to the surface of the lake.
c)tends to be polarized with its electric field vector perpendicular to the surface of the lake.
d)has undergone refraction by the surface of the lake.
e)none of the above is true.