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The parallel rays of light incident on the concave mirror converge to the focal point (f) after reflection, and the focal point is located at half the distance between the center of curvature (c) and the mirror. If the cooker is placed in the focal point of the large concave mirror, it can receive the sunlight to heat and become the solar cooker. Such as lights or searchlight light source on the concave mirror focus position can make the light reflects the parallel light. Objects outside the center of curvature can be reflected as inverted real images, such as reflective telescopes. The convex mirror's reflecting surface faces away from the center of the curvature, and the object becomes a reduced erect image behind the mirror, which can reflect a wide range of reduced landscapes such as a car rearview mirror