The blue tint of a coated camera lens is largely caused by what effects?
a. diffraction
b. refraction
c. polarization
d. interference
[Ques. 2] Light travels from inside a building to outside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. A 180o phase change occurs at the inside surface but not at the outside surface.
b. A 180o phase change occurs at the outside surface but not at the inside surface.
c. A 180o phase change occurs at both the inside surface and the outside surface.
d. No phase change occurs at either the inside surface or the outside surface of the glass.
[Ques. 3] Light travels from outside a building to inside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. No phase change occurs at either the inside surface or the outside surface of the glass.
b. A 180o phase change occurs at both the inside surface and the outside surface.
c. A 180o phase change occurs at the inside surface but not at the outside surface.
d. A 180o phase change occurs at the outside surface but not at the inside surface.
[Ques. 4] Dielectric mirrors are made to have extremely high reflectance
a. by stacking thin layers of a single dielectric material on a glass backing so that the reflections from the surfaces of the layers undergoconstructive interference.
b. by stacking thin layers of a single dielectric material on a glass backing so that the reflections from the surfaces of the layers undergo destructive interference.
c. by stacking thin layers of different dielectric materials on a glass backing so that the reflections from the surfaces of the layers undergo constructive interference.
d. by stacking thin layers of different dielectric materials on a glass backing so that the reflections from the surfaces of the layers undergo destructive interference.
[Ques. 5] Perfect mirrors are made by
a. coating a glass surface with an extremely pure layer of silver or aluminum.
b. coating a glass surface with an extremely pure layer of silver or aluminum and then coating the metal surface with a quarter-wavelength thickness of the dielectric magnesium fluoride.
c. stacking thin layers of different dielectric materials on a glass surface.
d. heating an ordinary mirror almost to its melting point.
[Ques. 6] A surface is coated with a material having index of refraction 1.41 . If light in air has a wavelength of 701 nm and is normally incident on this surface, and it is found through interference effects with this light that the surface is 11 wavelengths thick, which of the following is the thickness of the surface?
a. 4.5E8 m
b. 5.5E6 m
c. 2.7E6 m
d. 1.4E6 m
e. 2.1E5 m
[Ques. 7] Two thin layers of material with different indices of refraction are coated on a glass plate. The outer first material has n1 = 1.461, the inner second material has n2 = 1.544, and the glass has nglass = 1.62 . If light is incident from air on the first layer, what is the phase change for light that reflects from the glass?
a. 180
b. 0
c. 360
d. 540
e. 720
[Ques. 8] Newton's rings:
a. are a sound that light can cause.
b. require oil to occur.
c. are a result of Fraunhofer diffraction.
d. are an interference phenomenon.
[Ques. 9] A possible means for making an airplane radar-invisible is to coat the plane with an antireflective polymer. If radar waves have a wavelength of 6.00 cm, and the index of refraction of the polymer is n = 1.68, how thick would the coating be if a 180 phase change occurs at both surfaces?
a. 17.9 mm
b. 35.7 mm
c. 8.93 mm
d. 4.46 mm
e. 25.2 mm
[Ques. 10] A puddle of water (n = 1.33) is covered with a very thin layer of oil (n = 1.20). How thick is the oil in the region that strongly reflects light with a wavelength of 531 nm?
a. 111 nm
b. 221 nm
c. 443 nm
d. 295 nm
e. 239 nm
Quick Reply
