The focal length of a concave lens is considered to be [[1]].

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Detailed Solution

The focal length of a concave lens is considered to be negative.
According to the sign convention, the focal length of a concave lens is always negative.
Concave lens:
●        A concave lens is a type of lens that diverges a straight light beam from the source into a diminished, upright, virtual image.
●        It can create both real and virtual images. At least one inside surface of concave lenses is curved.
●        A diverging lens is a concave lens that is made round inwards in the middle and bulges outwards through the corners, causing light to diverge on it.

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