An object is placed in front of a concave mirror and
it produces a real image of magnification 1.5. If the
object distance is decreased by 5 cm, the magnifi-
cation of the real image is increased to 4. Find the
focal length of the concave mirror.
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Magnification = -vu where, v = image distance and u = object di. ... The focal length of the mirror is. A . 15 c m 15\ cm 15 cm. B .take care
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