2. Refer to the figure below, which shows the wavefronts for a double-slit inter

Question

2. Refer to the figure below, which shows the wavefronts for a double-slit interference experiment with light sources labeled S1 and S2. At which of the labeled points (A, B or C) is the intensity of light zero?

Point A

Point B

Point C

Both Points A and B

4. The colors of a soap bubble or an an oil film on water are produced by:

selective absorption and reflection

diffraction

interference

refraction

5. 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

7. Referring again to the setup in Question 5, 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

10. 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

11. Look at the diffraction pattern shown below. How was it produced?

Light shining through a double slit

Light shining through a single slit

Light shining through many slits

Light shining through a circular hole

12. In the figure below, which roman numeral represents a 2nd order minimum?

II

III

IV

V

15. 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

20. 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

Question 2 Figure

Point A

Point B

Point C

Both Points A and B

Explanation / Answer

4.interference

explanation:

The colors of a soap bubble or an an oil film on water are produced by

Interference between the light waves that get reflected from the top of the oil layer and the light waves refelected from the bottom of the oil layer. The angle under which constructive interference takes place depends on the thickness of the layer and on the index of refraction. The latter is different for different wavelengths so we see the colors at slightly different angles. So looking at one part of the puddle gives you a slightly different angle than looking at another part. Therefore you will see them in a different colo

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