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  4. Two plane mirrors A and B are parallel to each other and spaced 20 cm apart. An object is kept in between them 15 cm from A. Out of the following at which point is an image not formed in mirror A (distances measured from the mirror A )

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Q. Two plane mirrors $A$ and $B$ are parallel to each other and spaced $20\, cm$ apart. An object is kept in between them $15\, cm$ from $A$. Out of the following at which point is an image not formed in mirror $A$ (distances measured from the mirror $A$ )

Ray Optics and Optical Instruments

Solution:

image
From $A$
$I$ is at $15\, cm$
$I^{\prime}$ is at $25\, cm$
$II$ is at $25 \,cm$
$II ^{\prime}$ is at $45\, cm$ and so on.
The distance of $45\, cm$ from $A$ for any image is absent.