physics

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A lamp which is 9.0 cm tall is in front of a concave mirror which has a focal length of 53.0 cm.
(a) How tall is the lamp's image if the lamp is a distance of 26.5 cm from the mirror (include sign if negative)?

(b) How tall is the lamp's image if the lamp is a distance of 63.6 cm from the mirror (include sign if negative)?

(c) How tall is the lamp's image if the lamp is a distance of 111.3 cm from the mirror (include sign if negative)?

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