![Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is](https://www.gkseries.com/blog/wp-content/uploads/2022/05/Two-lenses-of-power-3-and-1-diopters-are-placed-in-contact.-The-focal-length-of-the-combined-lens-is-.png)
Q. Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is
A. 100 cm
B. 25 cm
C. 50 cm
D. 30.3 cm
Answer: 50 cm
A. 100 cm
B. 25 cm
C. 50 cm
D. 30.3 cm
Answer: 50 cm
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