What light phenomenon is the shadow play formed?

Shadow play is formed by using the principle of straight-line propagation of light.

Shadow play, also known as shadow play or lamp shadow, is a kind of folk drama that uses lights to illuminate the silhouette of people made of hides or cardboard to perform stories. In the performance, the artists manipulated the opera characters behind the white curtain, sang stories with local popular tunes, and matched them with percussion instruments and strings, which had a strong local flavor.

The formation principle of shadow play is that light travels in a straight line, that is, light travels in a straight line in the same uniform medium. When light shines on an opaque object, it will be blocked by the object, forming a dark area, which is the shadow. Shadow play is to illuminate the shadow characters through lights and project their shadows on the white curtain, so that the audience can see the vivid opera performance.

The performance form of shadow play is very unique. Artists manipulate shadow puppets with their fingers to make them make various actions, such as walking, jumping and waving weapons. At the same time, with music, singing and singing, it creates a unique artistic atmosphere. The performance of shadow play is rich and colorful, covering many subjects such as history, myths and legends, and has high artistic value and cultural connotation.

The application of straight-line propagation of light;

1, pinhole imaging: The principle of pinhole imaging is the linear propagation of light. When light passes through a small hole, it will form a real reflection on the screen. This is because the light can only travel in a straight line after passing through the small hole and cannot bypass the objects on the screen.

2. Solar eclipse and lunar eclipse: Solar eclipse and lunar eclipse are one of the most obvious examples of straight-line propagation of light. When the earth, the moon and the sun are in the same line, the moon will block the sunlight and form an eclipse; When the earth blocks the sunlight, it will form an eclipse.

3. Shadow: The formation of shadow is also the result of the straight-line propagation of light. When light shines on an opaque object, it will be blocked by the object, forming a dark area, which is the shadow.

4. Sight distance measurement: When measuring the distance between two points, we can use the principle of straight-line propagation of light to measure. Put a ruler vertically between two points, and then measure the projection length of the ruler between the two points, and you can get the distance between the two points.

5. Optical instruments: optical instruments such as telescopes and microscopes all use the principle of straight-line propagation of light. The telescope collects light from distant objects, amplifies it and images it on the retina of the observer; Microscope can clearly see the details of tiny objects by magnifying them and imaging them on the retina of the observer.