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Q.

[78]

The [[1]] lens is used in peepholes.


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Detailed Solution

The concave lens is used in peepholes.
A single concave lens or combination of concave lenses is used in peepholes. Security tools like peepholes or door viewers provide a wide-angle view of things outside walls or doors. A concave lens allows for a broader perspective of the object or region while minimising the object's dimensions.
 
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