What Is a Simple Reflex?

The light source is capable of emitting light to the surroundings. In order to clearly and intuitively represent the propagation of light, we use a straight line with an arrow to represent the propagation path of light. This straight line with an arrow is a physical model-light, where the straight line indicates that the light's propagation path is straight

Basic reflection

Right!

Light source

Can shine itself

Only in the same homogeneous medium can light travel in a straight line. The shadow, solar eclipse, lunar eclipse and pinhole imaging common in daily life are all phenomena caused by light traveling in a straight line. By using light to propagate in a straight line, we can stand in line, we can use laser for collimation, and we can also shoot and aim. Of course, light traveling in a straight line sometimes brings inconvenience to our lives. For example, direct sunlight in summer can easily cause sunburn. To this end, we can use parasols to block the strong sunlight to avoid this disadvantage.

When light hits the surface of any object, a part of the light is reflected back by the surface of the medium. This phenomenon is called light reflection. When reflection occurs, the reflection angle is always equal to the incident angle. The reflected light path is reversible. Therefore, we can use the reflection of light to direct sunlight to the bottom of the well, and use the law of light reflection to make a bicycle taillight consisting of a right-angle reflection surface and a periscope composed of a pair of flat mirror surfaces at a 45 ° angle to the horizontal plane.

When light strikes the surface of a smooth object and the surface of a rough object, different reflections occur. When parallel light does not shine on the surface of a smooth object, the reflected light is still parallel. This reflection is called specular reflection. When a parallel beam hits the surface of a rough object, the reflected light will be directed in all directions. This reflection is diffuse reflection. No matter whether it is specular or diffuse reflection, each light will strictly follow the light reflection rule.