other govt exam AAI Junior Assistant (Fire Service) 2025 Mock Test General Science Physics Optics

An ice-ball of 6 cm diameter is placed 30 cm in front of a concave mirror and its principal focus is double the distance of the object. Following the new Cartesian sign convention, the diameter of the image is:

1

16 cm

2

12 cm

3

10 cm

4

14 cm

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