If the image formed by a lens for all positions of an object placed in front of it is always erect and diminished, the nature of the lens is concave lens.
Ray diagram justifying the same is as follows:
Given: Power of the lens (P) is -10D (since concave lens hence negative sign is introduced).
Therefore focal length (f) is calculated in the following way:
Hence the focal length is -0.1m or -10cm.
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