The Application of concave mirror
1. Use concave mirror to concentrate light: solar cooker, desk lamp, TV satellite antenna, radar.
2. The light passing through the focus is reflected into parallel light parallel to the main shaft: searchlights, flashlights and headlight lampshades of various motor vehicles.
3. The collection ceremony of the Olympic flame is also based on the principle that concave mirror concentrates on forming heat.
Brief introduction of concave-convex mirror
Concave mirror, that is, concave parabolic mirror. When parallel light shines on it, it is focused on the focus in front of the mirror by its reflection. The reflecting surface is concave and the focus is in front of the mirror. When the light source is in focus, the emitted light is reflected to form parallel beams, also called concave mirror and condenser.
Imaging principle
Concave mirror's principle is reflection imaging. Convex lens is refractive imaging, and concave mirror plays a condensing role, and the imaging is different according to the object distance.
Mirror (including convex mirror) is an instrument that does not transmit light, but reflects it back. Light obeys the law of light reflection.
Concave mirror can not only make parallel light converge at the focal point, but also reflect the light from the focal point into parallel light.
Different imaging characteristics
A convex lens is refractive. An image can be an inverted and enlarged real image, or an inverted and equal real image, or an inverted and reduced real image, or an upright and enlarged virtual image.
Concave mirror is reflective imaging. An image can be an inverted and enlarged real image, or an inverted and equal real image, or an inverted and reduced real image, or an upright and enlarged virtual image. It looks the same, but it's actually different: the real image of the convex lens is on the opposite side of the object, and the virtual image is on the same side of the object; Concave mirror's real image is on the same side as the object, and the virtual image is on the opposite side).
Mirror (including convex mirror) is an instrument that does not transmit light, but reflects back the image, and light obeys the law of reflection.
The convex lens can be an inverted enlarged, equal-sized and reduced real image, or an upright enlarged virtual image. Parallel light can also converge, and the light emitted from the focus can be refracted into parallel light.
Because concave mirror is reflective imaging, there will be no chromatic aberration, which is an incomparable advantage for any lens imaging. The resolution of the telescope is proportional to the aperture of the objective lens, but it is extremely difficult to manufacture a large-aperture lens, while the concave mirror manufactured by using the reflection principle is much easier to manufacture.