MindMap Gallery light and waves
This is a mind map about light and waves, summarizing the polarization of light, diffraction of light, interference of light, total reflection of light, Refraction of light, etc.
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Avatar 3 centers on the Sully family, showcasing the internal rift caused by the sacrifice of their eldest son, and their alliance with other tribes on Pandora against the external conflict of the Ashbringers, who adhere to the philosophy of fire and are allied with humans. It explores the grand themes of family, faith, and survival.
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light and waves
simple harmonic motion
F=-kx
Acceleration is proportional to the displacement from the equilibrium position and opposite in direction
Amplitude: A
Period: T=2π/ω
Frequency:f=1/T
Phase:ωtφ
First phase:φ
Damped vibration
definition
A vibration that decreases in amplitude over time
forced vibration
The vibration of the system under the continuous action of periodic external forces
mechanical wave
forming conditions
There is a wave source that generates mechanical vibrations
There are propagation media such as air, water, etc.
type
transverse wave
The direction of particle vibration is perpendicular to the direction of wave propagation
Longitudinal wave
The direction of particle vibration is parallel to the direction of wave propagation
physical quantity
wavelength
The length λ of a complete wave line, determined by the wave source and medium
cycle
Determined by wave source
Frequency ν
Wave speed
Depends on medium
interference of waves
condition
The frequencies of the two waves must be the same and the phase difference remains unchanged.
Phenomenon
Forming alternating light and dark interference fringes
diffraction of waves
condition
Conditions that produce significant diffraction, where the size of the obstacle or hole is smaller than or similar to the wavelength
Phenomenon
Waves are able to bypass obstacles or holes and continue forward
Doppler effect
condition
There is relative motion between the sound source and the observer
Phenomenon
The observer perceives a change in frequency
Nature
The frequency of the sound source remains constant, but the frequency received by the observer changes.
refraction of light
refractive index
definition
When light is refracted from a vacuum into a medium, the ratio of the sine of the incident angle to the sine of the refraction angle
formula
n=sinθ1/sinθ2=c/v
The refractive index of vacuum is 1, and the refractive index of air is approximately 1
The greater the refractive index, the greater the degree of deflection
total reflection of light
optically dense medium
medium with small refractive index
optically sparse medium
Medium with a high refractive index
condition
When light enters an optically rarer medium from an optically dense medium, the incident angle is greater than or equal to the critical angle of total reflection.
Phenomenon
All refracted light disappears, leaving only reflected light
interference of light
double slit interference
thin film interference
The relationship between interference fringes and wavelength
The center distance between two adjacent bright stripes or dark stripes Δx=lλ/d
The longer the wavelength of light, the longer the distance between the centers of two adjacent bright or dark fringes in interference fringes.
diffraction of light
The phenomenon of light continuing to propagate around obstacles
The longer the wavelength of light, the more obvious the diffraction phenomenon is.
polarization of light
Natural light
all directions
polarized light
vibrate in a specific direction