- #1
riseofphoenix
- 295
- 2
:(:(
tiny-tim said:hi riseofphoenix!
show us your full calculations, and then we'll see what went wrong, and we'll know how to help!
riseofphoenix said:Question 1: why did they give me this if i didn't have to use it?
Question 2: what do they mean by the term "first order"? I never understand :(
I don't understand their explanation though :(:(:(
Particularly this part: "Since nair < nair < nwater, light reflected from both top and bottom surfaces of the oil film experiences phase reversal."
Question 3: What's phase reversal??
Question 4: And why is this considered "constructive interference"? :(
The indexes of refraction for a substance can be found by using a refractometer, a device that measures the bending of light as it passes through the substance. Alternatively, you can also look up the indexes of refraction for the specific type of oil in a reference table.
The formula for calculating the thickness of oil is: Thickness = (λ / 2) * [(n2 - n1) / (n2 + n1)], where λ is the wavelength of light used and n1 and n2 are the indexes of refraction of the two materials.
No, the wavelength of light used in the formula must be known and consistent. It is recommended to use monochromatic light, such as a laser, for more accurate results.
No, the thickness of oil can vary depending on the angle at which the light passes through it. This is known as the angle of incidence and can affect the accuracy of the measurement.
Yes, the temperature and pressure of the oil can also affect its thickness. It is important to take these factors into consideration when conducting the measurement.