![A 10 mm long awl pin is placed vertically in front of a concave mirror](https://www.gkseries.com/blog/wp-content/uploads/2022/05/A-10-mm-long-awl-pin-is-placed-vertically-in-front-of-a-concave-mirror.png)
Q. A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
A. -30 cm
B. -20 cm
C. -40cm
D. -60 cm
Answer: -20 cm
A. -30 cm
B. -20 cm
C. -40cm
D. -60 cm
Answer: -20 cm
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