A thin film of oil (n=1.4) is floating on a piece of crown glass (n=1.55). We sh

Question

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

5 points   

Question 6

Referring to the setup in Question 5, the reflection of light off the top surface of the oil film is

hard, with a shift of half a wavelength (phase change of 180 degrees)

soft, with a shift of a quarter of a wavelength (phase change of 90 degrees)

hard, with no shift (zero phase change)

there is no reflection - all light is transmitted

5 points   

Question 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

367 nm

5 points   

Question 8

The distance between the two slits in a double-slit interference experiment is 0.040 mm. The second-order bright fringe (m = 2) is measured on a screen at an angle of 2.2

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

Explanation / Answer

1.soft, with a shift of half a wavelength (phase change of 180 degrees)

2. hard, with a shift of half a wavelength (phase change of 180 degrees)

3. 770 nm

4. half a wavelength shift (180 degree phase change)

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