A beam of light, which is traveling in air, is reflected by a glass surface....
A beam of light, which is traveling in air, is reflected by a glass surface. Does the reflected beam experience a phase change, and if so, by how much is the phase of the beam changed?
| The reflected beam does not experience a phase change. | |
| The reflected beam experiences a 90 |
Homework Answers
Glass has a higher index of refraction than air. When light traveling in a lower index of refraction medium (like air) reflects off of a higher index of refraction surface (like glass) there is a phase shift of pi or 180 degrees so the other answers are correct. On the other hand, if the light is in the glass and it reflects off the glass to air boundary, then there would not be any phase shift.
Putting these two together shows us why very thin soap bubbles appear black, the reflections off the front and back surfaces are totally out of phase since one has the 180 deg phase shift and the other doesn't have any phase shift so there is destructive interference. That is a simple anti-reflection surface.
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