A light bulb is placed 142 cm in front of a concave mirror
A light bulb is placed 14.2 cm in front of a concave mirror. When the concave mirror is replaced by a plane mirror in the same location, the bulb's image moves 4.40 cm closer to the mirror. Calculate the focal length of the concave mirror.
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a light bulb is placed 142 cm in front of a concave mirror when the concave mirror is replaced by a plane mirror in the
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