Find the focal length of a lens of power $-2.0 \, D$. What type of lens is this?
- A$-50 \, cm$; Concave lens.
- B$-0.50 \, cm$; Concave lens.
- C$-0.50 \, cm$; Convex lens.
- D$-50 \, cm$; Convex lens.
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