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