A deviating (negative) lens, or a arched mirror, does not focus a collimated axle to a point. Instead, the focus is the point from which the ablaze appears to be emanating, afterwards it campaign through the lens or reflects from the mirror. A arched emblematic mirror will reflect a axle of collimated ablaze to accomplish it arise as if it were beaming from the focal point, or conversely, reflect application directed against the focus as a collimated beam. A arched egg-shaped mirror will reflect ablaze directed appear one focus as if it were beaming from the added focus, both of which are abaft the mirror. A arched abstract mirror will reflect application appearing from the focal point in foreground of the mirror as if they were appearing from the focal point abaft the mirror. Conversely, it can focus application directed at the focal point that is abaft the mirror appear the focal point that is in foreground of the mirror as in a Cassegrain telescope.
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