A picture of a burning match with no shadow on the wall intrigued many people.
A photo of a burning match that leaves no shadow on the wall is attracting the attention of the online community. Many people wonder about the phenomenon of the burning light not leaving a shadow while the hand and the body of the match leave a shadow on the wall.
Some people have practiced this. They light a match and hold it 10-15 cm away from the wall. Shine a light through the hand holding the match. You will see only the shadow of the hand and the match appear on the wall, no flame.
Explaining this phenomenon, Mr. Dinh Hoang Tung (Physics teacher in Ha Long, Quang Ninh) said that when doing this experiment, lighting a match will definitely only see the hand and the body of the match on the wall, but there will be no shadow, because fire is not able to create an image on the wall. In other words, due to the difference in light intensity, in the case of strong external light, there will be no shadow. In some cases, the light of the object is weak, so it can still leave a shadow.
“Luminous intensity is a concept used to measure the light level of a light source”, Mr. Tung explained that this is a parameter used to determine the energy emitted from a light source in a certain direction.
Luminous intensity appears in many phenomena in life. It is considered one of the important factors in many fields such as lighting engineering, electronics, optics and display technology. It is used to describe the light level of a specific light source or a light area.
Another teacher also analyzed the interesting phenomenon that fire does not create shadows, because it does not hinder the movement of light. Fire itself is a light source, light will usually pass through it.