Medium
Two lenses have powers of $(a) +2 \text{ D}$ and $(b) -4 \text{ D}$. Find the nature and focal length of each lens.
- AConvex,$0.5 \text{ m}$ and Concave,$-0.25 \text{ m}$
- BConcave,$0.5 \text{ m}$ and Convex,$-0.25 \text{ m}$
- CConvex,$0.25 \text{ m}$ and Concave,$-0.5 \text{ m}$
- DConcave,$0.25 \text{ m}$ and Convex,$-0.5 \text{ m}$
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