Shulou(Shulou.com)11/24 Report--

I believe everyone is a good boy with integrity and kindness.

Never had the experience of peeking through the door

The editor obviously didn't either.

But curious.

What would the image look like in the crack of the door?

Then let's analyze it from a theoretical point of view.

Do a thought experiment.

Suppose we have two very narrow "door slits" (slits) b and c ("door seams" are very close to each other).

The light irradiated by the point light source to S1 reaches b and c through the slit an and finally falls on the light screen F.

At this time, someone is going to say, what is there to analyze? aren't there two bright gaps on the light screen?

Like this ~

But in fact, it is.

There are only two "cracks in the door".

Why are there so many stripes?

Is there something unclean around you?

Is there a ghost in the crack in the door?

Hey, let the versatile editor help you to ward off demons and evil spirits.

The principle of the secret method of exorcism light is a kind of electromagnetic wave, which is an oscillating particle wave emitted in space by electric and magnetic fields with the same direction and perpendicular to each other, and is an electromagnetic field propagating in the form of waves.

Monochromatic light is a sine wave, which is the same as the sine curve in mathematical form, that is,

Where An is the amplitude, which determines the brightness (intensity) of monochromatic light; ω is the circular frequency, which determines the color (frequency) of monochromatic light; λ is the wavelength; z is the distance of light wave propagation on the z axis; it is called phase.

From a physical point of view, the sine wave is the projection of a circular motion on the y-axis, the amplitude An is the radius of the circular motion, the circular frequency ω is the angular velocity of the circular motion, and the phase is the angle between the circular motion radius vector and the x-axis.

The superposition of two lights in the secret method of exorcism.

Suppose there are two light sources S1 and S2, which emit light in the same direction and frequency. At S1 and S2, the light waves are:

The P point is the point where the two light beams meet, and the distances from P to S1 and S2 are R1 and R2 respectively, so the light vibration produced by the two light waves at the P point can be written as follows:

The resultant vibration of point P is:

Through the sum-difference product formula, we can obtain:

It can be seen that the combined vibration of P point is also a simple harmonic vibration, the vibration frequency and direction are the same as the two monochromatic light waves, and the amplitude An and initial phase φ are determined by the following formula.

Do you feel dizzy and foggy to see so many mathematical formulas? Knowing that everyone only likes pictures but not words, the intimate editor has prepared a graphic method!

As mentioned in the secret method of repelling evil spirits, the vibration of light waves can be regarded as the projection of circular motion on the y-axis, then the superposition of light waves satisfies the parallelogram rule of vector superposition, and the length An of the combined vibration vector is the amplitude. The angle between the combined vibration vector and the x-axis is the initial phase φ.

The interference of three lights in the secret method of exorcism

Let's look back at the initial door seam experiment. When light waves with the same vibration direction and frequency are transmitted from the cracks b and c, interference will occur on the light screen.

For example, the second book of evil secrets:

Among them, A1=A2

The intensity (brightness) of the combined vibration is only related to R1 and R2, and the R1 and R2 corresponding to different points on the screen are not the same.

When the r1-r2 is equal to the integer multiple of the wavelength, that is, the angle between the vibration vectors is 0 °, the A=A1+A2, called phase-length interference, has the maximum brightness.

The angle between vibration vectors is 0 °.

When r1-r2 is equal to odd times of half-wavelength, that is, the angle between vibration vectors is 180 °, this is called cancellation interference, and the brightness is minimum.

The angle between vibration vectors is 180 °.

When r1-r2 is equal to other numbers, that is, the angle between the vibration vector is between 0 °and 180 °.

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