When an object is moved along the axis is of a lens images three times the size

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When an object is moved along the axis is of a lens images three times the size, of the object are obtained when the object is at 16 cm and at 8 cm respectively from the lens. The focal length and nature of the lens are
17
Nov
When an object is moved along the axis is of a lens images three times the size, of the object are obtained when the object is at 16 cm and at 8 cm respectively from the lens. The focal length and nature of the lens are of the object are obtained when the object is [...]
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