$A$ candle placed $25 \ cm$ from a lens forms an image on a screen placed $75 \ cm$ on the other side of the lens. The focal length and type of the lens are:
- A$+ 18.75 \ cm$ and convex lens
- B$- 18.75 \ cm$ and concave lens
- C$+ 20.25 \ cm$ and convex lens
- D$- 20.25 \ cm$ and concave lens
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