1) When light passes through a narrow opening, it spreads out. This is due to
a) refraction
b) dispersion
c) diffraction
2) When two light rays come together and produce darkness, this is called
a) constructive interference
b) destructive interference
c) diffraction
d) dispersion
3) Dispersion occurs in a glass prism because
a) light travels slower in glass than in a vacuum
b) the angle of incidence is greater than the critical angle
c) the index of refraction is a function of wavelength
d) of constructive interference of the different colors
4) When light passes through two closely spaced narrow slits and then is incident on a screen
a) there will be a single narrow bright line on the screen
b) there will be a single wide bright band on the screen
c) there will be alternating equally spaced bright and dark lines on the screen
d) there will be alternating unequally spaced bright and dark lines on the screen
5) A grating spectrometer can be used to measure
a) the wavelength of light
b) the speed of light
c) the brightness of light
d) the index of refraction of light
6) A diffraction grating produces a line for green light at 15º. It will produce a line for blue light
a) at 15º
b) at an angle greater than 15º
c) at an angle less than 15º
Ans: 1-c, 2-b,
3-c, 4-c, 5-a, 6-c