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Figure shows an object AB and a plane m...

Figure shows an object `AB` and a plane mirror `MN` placed parallel to object. Indicate the mirror length required to see the image of object if observer's eye is at `E`.

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Required length of mirror `= MN`

`Delta MNE & Delta A' B' E'` are similar
`(MN)/(OE) = (A' B')/(C' E) rArr MN = (A' B')/(2) = (AB)/(2)`
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