Light impinges on a slit but suffers very little diffraction. We conclude that t
ID: 1465694 • Letter: L
Question
Light impinges on a slit but suffers very little diffraction. We conclude that the wavelength of the light is
Much shorter than the slit width
Much longer than the slit width
About the same order as the slit width
We cannot say anything about the wavelength
Huygens' principle states that to understand how light propagages, we should pretend that
one special point along the entire wave front acts as a point source of light emitting a new spherical wave
each point along a wave front emits a plane wave in a random direction
each point along a wave front is a point source of light emitting a new spherical wave
each point along a wave front emits a ray of light which can be followed
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central fringe and a number of other fringes on either side, their intensity decreasing with distance from the central fringe. If the wavelength of the light is increased:
The fringes in the pattern move farther apart
The fringes in the pattern move closer together
The central fringe gets fainter
The outer fringes get fainter and also move farther apart
A thin film of oil (n=1.4) is floating on a piece of crown glass (n=1.55). We shine light onto the film. The reflection of the light off the bottom surface of the film is
hard, with no shift (zero phase change)
soft, with a shift of half a wavelength (phase change of 180 degrees)
hard, with a shift of half a wavelength (phase change of 180 degrees)
there is no reflection - all is transmitted
Referring to the setup in the question above, suppose we shine light of wavelength 550 nm onto the film. What is the wavelength of that light when it's inside the film?
550 nm
275 nm
183 nm
390 nm
A.Much shorter than the slit width
B.Much longer than the slit width
C.About the same order as the slit width
D.We cannot say anything about the wavelength
Explanation / Answer
1.
Light impinges on a slit but suffers very little diffraction. We conclude that the wavelength of the light is
Much shorter than the slit width
2.
Huygens' principle states that to understand how light propagages, we should pretend that
one special point along the entire wave front acts as a point source of light emitting a new spherical wave
3.
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central fringe and a number of other fringes on either side, their intensity decreasing with distance from the central fringe. If the wavelength of the light is increased:
The fringes in the pattern move farther apart
4.
A.Much shorter than the slit width
2.
Huygens' principle states that to understand how light propagages, we should pretend that
A.one special point along the entire wave front acts as a point source of light emitting a new spherical wave
3.
When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central fringe and a number of other fringes on either side, their intensity decreasing with distance from the central fringe. If the wavelength of the light is increased:
A.The fringes in the pattern move farther apart
4.
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