What image does light refract into, a virtual image or a real image?

The refraction of light can be a real image or a virtual image.

Analysis: the image formed by actual light convergence is a real image; The image formed by the convergence of the reverse extension lines of the actual light is a virtual image.

1, real image

Pinhole imaging is a real image formed by linear propagation of light; The lens of a camera is formed according to the principle of inverting and reducing an object when it is out of twice the focal length. The projector is based on the principle that the real image is inverted and enlarged when the object is located between one focal length and two focal lengths. All the above situations are real images.

2. Virtual image

The characteristics of plane mirror imaging are vertical equivirtual image, the connecting line of object image is perpendicular to the mirror surface, and the distance from object image to plane mirror is equal; Seeing things in the water as virtual images is formed by the refraction of light; The imaging principle of magnifying glass is that when the object is in focus, a vertically enlarged virtual image can be observed through the lens. All the above situations are virtual images.

Extended data-related applications

1, people invented lenses by using the principle of refraction, including convex lenses and concave lenses, which are subdivided into six types: biconvex, plano-convex, concave-convex, biconcave, plano-concave and convex-concave.

Lens is the most basic optical element in microscope optical system. The objective lens, eyepiece and condenser are all composed of Dan Toujing and multiple lenses. Such as a magnifying glass, a telescope, a microscope and the like.

2. People also applied the principle of total reflection of light to modern communication and invented optical fiber.

Optical fiber is not an electrical signal, but an optical signal, which makes the signal transmission distance much farther than that on cable, saving cost and expanding bandwidth.

The optical fiber is divided into two layers, and the density of the inner layer and the outer layer is different, which creates conditions for total reflection; In this way, when light is incident at a certain angle, total reflection can be generated according to the principle of total reflection, so the energy consumed by light propagating in the optical fiber is very small, so the optical signal needs to be strengthened through the repeater after propagating in the optical fiber for a certain distance.

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