![Power of the lens is -40, its focal length is](https://www.gkseries.com/blog/wp-content/uploads/2022/05/Power-of-the-lens-is-40-its-focal-length-is.png)
Q. Power of the lens is -40, its focal length is
A. 4m
B. -40m
C. -0.25m
D. -25m
Answer: -0.25m
A. 4m
B. -40m
C. -0.25m
D. -25m
Answer: -0.25m
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