Answer:
It is a concave lens.
Power of a lens is given by the relation
\[P=\frac{1}{f(in\text{ }metre)}\]
P = 10 D
\[f=\frac{1}{P}=\frac{1}{10}=0.1m\]
Or \[10\text{ }cm\], as lens is concave lens.
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