A convex lens forms a real image at 30 cm from its optical centre. The object is placed at 20 cm from the lens. Using the sign convention, what is the correct sign and value for the focal length of the lens?

Subject: General Awareness | Topic: Science | Difficulty: MEDIUM

Options

1. (A) +60 cm
2. (B) +12 cm
3. (C) -60 cm
4. (D) -12 cm

Verified Answer

Option (B): +12 cm

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