Does light travel in a straight line? What is small hole imaging?

Yes, there is no doubt about it, there are studies that say it may also spread in a straight line, and this is because:

1. Light actually travels in a straight line along space-time, but the strong gravitational force distorts space-time, so light travels along the distorted "straight line".

2. Light will bend and propagate in a non-uniform medium, and the gravitational field is also a medium, and when the curvature of the force field gradient is large enough, the propagation of light will be obviously bent.

About small hole imaging is: use a plate with small holes to block between the screen and the object, and the inverted image of the object will be formed on the screen, we call this phenomenon small hole imaging. As shown in the figure, this is because light travels in a straight line.

<> a plate with a small hole is used to block between the screen and the object, an inverted image of the object will be formed on the screen, and we call this phenomenon small hole imaging. Move the middle plate back and forth, and the size of the image will also change. This phenomenon reflects the nature of light propagating in a straight line.

Light travels in a far straight line, and the image of the small hole is based on this fact. To be precise, aperture imaging is meant to illustrate this fact.

Light travels in a straight line.

Aperture imaging is a powerful example of light propagating in a straight line.

Light travels in a straight line! The basic principle of small hole imaging is that light travels in a straight line! The hot test point here is "the size of the image of the small hole (real image) is only related to the size of the object, not the size of the hole!" Hope it helps you ( o ) !

Yes, the basic principle of aperture imaging is that light travels in a straight line.

Be; A well-known optical phenomenon.

Aperture imaging is the linear propagation of light.

Aperture imaging, a natural phenomenon, with a plate with a small hole to block between the wall and the object, the wall will form an inverted solid image of the object, we call such a phenomenon aperture imaging. When the middle plate is moved back and forth, the size of the image on the wall also changes, which illustrates the nature of light propagation in a straight line.

Aperture imaging, a Chinese scholar Mo Zhai (Mozi) and his students, did the world's first experiment of small hole inverted image, explaining the phenomenon of small hole inverted image, which illustrates the propagation of light along a straight line.

nature of application

The linear propagation nature of light has been widely used in the ancient astronomical calendar of China. Our ancestors made the Gui watch and the sundial to measure the length and direction of the sun and shadow to determine the time, winter solstice, and summer solstice; A speculum is attached to an astronomical instrument to observe celestial phenomena and measure the position of stars.

In addition, China has long used this property of light to invent shadow puppetry. At the beginning of the Han Dynasty, Qi Shaoweng used paper to cut people and objects to perform behind the white screen, and illuminated with light, the images of people and objects were reflected on the white screen, and people outside the screen could see the oak preparation performance of the images. Shadow puppetry was very popular in the Song Dynasty, and later spread to the West, causing a sensation.

The wave theory of light, such as Young's interference experiment, double-slit experiment and other light interference experiments play a key role, and the principle of small hole imaging and the method of interference experiment are still very useful in modern physics.

1.Find a physics textbook for yourself.

2.Direct ratio. Follow the conclusion of the second question and list the equation for the third question. The diameter of the spot is equal to the distance from the diameter of the sun to the hole.

The solution is x = ninth power (m).

1400000000 1.4 billion meters. 1,400,000 kilometers.

(2) After finding that the position of the candle and the small hole is fixed, the farther away the image is from the small hole, the larger the image He measured the height of the image at different distances and filled it in **:

Like the height h cm

Like the distance to the hole s cm

Based on the data in the table, it can be concluded that after the position of the candle and the hole is fixed, the height h of the image is formed by the distance s from the image to the hole.

Proportional (optionally "proportional" or "inverse").

3) The student knows that the circular spot under the shade of the tree is the image of the sun on the ground through the small hole between the leaves, and he measured the diameter of the light spot, the distance from the spot to the hole, and the distance from the sun to the earth from the book, so that the diameter of the sun can be estimated.

(1) Draw your own.

2) Proportional. 3) Multiply 10 to the 9th power.

Light travels in a straight line, and aperture imaging is a manifestation of light traveling in a straight line.

Aperture imaging is a physical phenomenon that occurs because light travels in a straight line. One of the specific experiments was to use a plate with a small hole between the wall and the object, and the reflection of the object would be formed on the wall, and the size of the image on the wall would also change when the middle plate was moved back and forth. Cameras, circular spots of sunlight shining on the ground through leaves, and projectors.

Imaging of small holes. 1.Interpretation: Use a plate with small holes to block between the wall and the object, and the reflection of the object will be formed on the wall, which we call the phenomenon of small hole imaging.

2.Allusion: About 2,4500 years ago, a Chinese scholar Mo Zhai (Mozi) and his students conducted the world's first experiment on the formation of an inverted image of a small hole, explaining the reason for the formation of an inverted image of a small hole, and pointing out the nature of the linear progression of light.

This is the first scientific explanation of the linear propagation of light.

3.Nature and application: Some cameras and camcorders now use the principle of small hole imaging - the lens is a small hole (most of them are equipped with a convex lens to ensure the light imaging distance), and the scene enters the dark room through the small hole, and is left on the film by some special chemicals (such as contrast agent, etc.) (digital cameras, video cameras, etc. store the image in the memory card through some image sensors).