A convex lens of focal length 20 cm and a concave mirror having their principal...
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Physics
A convex lens of focal length 20 cm and a concave mirror having their principal axes along the same lines are kept 80 cm apart from each other The concave mirror is to the right of the convex lens When an object is kept at a distance of 30 cm to the left of the convex lens its image remains at the same position even if the concave mirror is removed The maximum distance in cm of the object for which this concave mirror by itself would produce a virtual image would be
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