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The image can be observed behind a wall using a periscope with the help of a plane mirror by [[1]] of light.

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Detailed Solution

The image can be observed behind a wall using a periscope with the help of a plane mirror by the reflection of light.
Periscope works on the concept of reflection of light by a polished smooth surface. We can see the object by periscope, which is not in our line of sight.
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