The parallel light is concave mirror to the focus (f) After the reflection, and the focus position is at 1/2 of the curvature Center (c) and the mirror distance. If the cooker is placed in the large concave mirror focus position, it can accept sunlight gathering and heating to become a solar cooker. If the light source in the headlight or searchlight is placed in the concave mirror focal position, the light reflects the parallel light. objects can be reflected in inverted real image, such as reflective telescopes, when they are outside the center of curvature. The reflector of the convex mirror is back to the center of curvature, and the object becomes a narrowing of the standing image behind the mirror, reflecting a wide range of narrowing landscapes, such as car rearview mirrors
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