Physical oil film interference problem, master advance

The reflected light of the front film and the reflected light of the back film form an interference, that is, the front film and the back film are equivalent to two light sources.

Colored oil film. The oil film has a thickness, and when the light encounters the upper and lower surfaces of the oil film, it will reflect back a part of it, and the light of the same frequency has an optical path difference, and interference will occur.

And dispersion is the name of junior high school.

The second problem of the landlord is that when the width of the double seam increases, it is a bit of a problem. The formula for the spacing of light and dark fringes for double-slit interference is.

l x=--- into d is the double-slit spacing, l is the distance from the double-slit to the screen, d into is the wavelength.

The formula is exactly the same as the formula for double-slit interference, except that d represents the width of the seam.

According to the above formula, we can get that both answers are decreased.

There are formulas, you look at physics books, and there are also the origin of formulas.

The diameter is about.

Molecular diameter measured by oil film method [Note: symbol " "means power] Since: v=sd, where v=1mm3=1 10 (-9)m3, s=3m2, then the molecular diameter d is:

d=v/s=

b Dispersion is because when light is emitted into a medium (such as a prism) from a vacuum (air), different colors of light with different wavelengths have separated in the prism, and dispersion occurs when it returns to air.

The oil film is because after the light enters, it passes through the bottom layer of the oil film (imagine that the oil film is greatly enlarged. Reflection, and the oil film is not as smooth and flat as a mirror, so interference occurs when light is reflected.

Supplement upstairs:

When it drops into the surface of the water, the layer of oil molecules in the middle of the diffusion is thicker than the edge, resulting in the refraction of light and interference

The thickness of the oil film is just so that the difference between the wavelength of the two reflected beams is an integer multiple of half the wavelength, and the reflection cancels out.

If only to distinguish for the sake of doing questions.

The simplest distinction is:

1.Interference is a phenomenon caused by the interaction of waves generated by at least 2 vibration sources (the light source is also the vibration source)2Diffraction is a phenomenon that occurs when a wave generated by a single vibration source encounters an obstacle, and the following information can be found for specific analysis.

In simple terms, interference requires two waves to meet during propagation.

Diffraction is a phenomenon in which a series of waves meet tiny holes.

According to quantum theory, the light wave is a probability wave, after a photon passes through the slit, the position of it reaching the opposite light screen is uncertain, but the probability of reaching what position is determined, this probability is related to the optical path, in the place where the probability is large, there will be bright stripes, and in the place with a small probability, there will be dark stripes.

1 1) "A soup that does not even heat up on the surface" is because the oil film separates the contact surface between the soup and the air, which effectively prevents the evaporation of the soup, so there is no hot air 2) "The soup that does not even heat up actually blanchs the raw meat slices", the soup is actually very hot, heat transfer occurs, and the heat absorption and heating of the meat slices can increase the amount of being blanched

2 The eardrum, vestibule, auditory nerve, 3 No Without a sudden drop in temperature, water vapor cannot condense into droplets.

Hehe, this topic is our topic back then!

The latter one makes sense, I don't know if the climbing rope you are talking about here is climbing at a uniform speed?