RRB Junior Engineer / DMS / CMA 2019 · Question 388 of 3719

The optician prescribes a corrective lens of power +2.5D. What does this mean?

1. AThe lens is a combo of 2 convex lenses, with powers 2D and 0.5DCorrect
2. BThe lens is a combo of 2 concave lenses, with powers 2D and 0.5 D
3. CThe lens is convex with power 2D
4. DThe lens is concave with power 2.5D