This is a mind map about light phenomena, summarizing the linear propagation of light, reflection of light, Refraction of light, dispersion of light, etc.
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This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about plant asexual reproduction, and its main contents include: concept, spore reproduction, vegetative reproduction, tissue culture, and buds. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about the reproductive development of animals, and its main contents include: insects, frogs, birds, sexual reproduction, and asexual reproduction. The summary is comprehensive and meticulous, suitable as review materials.
light phenomenon
straight line propagation of light
light source
Classification
natural light source
sun
firefly
artificial light
LED light
burning candle
definition
Objects that can emit light are called light sources
straight line propagation of light
Rule: In the same homogeneous medium, light propagates in a straight line
application
laser alignment
pinhole imaging
Phenomenon
shadow
solar eclipse, lunar eclipse
speed of light
reflection of light
law of reflection of light
Reflected ray, incident ray, in the same plane as the normal
Reflected light, incident light is located on both sides of the normal
The angle of reflection is equal to the angle of incidence
In the phenomenon of reflection, the light path is reversible
Two ways of reflection
reflection of mirror
When a parallel beam of light hits a smooth surface, the reflected light is still parallel. This reflection is called specular reflection.
diffuse reflection
When a beam of light hits an uneven surface, the reflected light is no longer parallel. This reflection is called diffuse reflection.
plane mirror imaging
The principle of plane mirror imaging
reflection of light
Plane mirror imaging rules
The line connecting the image and the object is perpendicular to the plane mirror
The distance between the image and the object to the mirror is equal
The image is equal in size to the object
plane mirror virtual image
Spherical mirror
concave mirror
effect
Concave mirrors concentrate light
application
solar cooker
convex mirror
effect
Convex mirrors diffuse light
application
Rearview mirror
traffic vision wide angle lens
refraction of light
law of refraction
When light passes from air into water or other medium
Refracted rays, incident rays are located on both sides of the normal
Refracted ray, incident ray, normal lie in the same plane
The angle of refraction is less than the angle of incidence
The angle of refraction increases with the angle of incidence and decreases with the angle of incidence.
When light rays are incident vertically onto the surface of a medium, the direction of propagation remains unchanged.
When light passes from water or other medium into air
The angle of refraction is greater than the angle of incidence
The rest is the same as above
refraction phenomenon
mirage
The sun can be seen when it appears before the horizon
dispersion of light
dispersion of light
visible light
red
orange
yellow
green
green
blue
purple
invisible light
infrared
application
night vision goggles
Non-contact infrared thermometer
TV remote control
definition
Invisible light with a wavelength greater than red light
UV rays
definition
Invisible light with a wavelength smaller than violet light
application
UV sterilization
Money detector
All light and invisible light follow the laws of light reflection and refraction
Three primary colors
red
green
blue