![Two thin lenses, one of focal length +60 cm and the other of focal length](https://www.gkseries.com/blog/wp-content/uploads/2022/05/Two-thin-lenses-one-of-focal-length-60-cm-and-the-other-of-focal-length.png)
Q. Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is
A. Minus 30 cm
B. Plus 30 cm
C. Minus 15 cm
D. Plus 30 cm
Answer: Minus 30 cm
A. Minus 30 cm
B. Plus 30 cm
C. Minus 15 cm
D. Plus 30 cm
Answer: Minus 30 cm
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