A lens with a power of +1.5 D is a convex lens. The positive power implies that the lens converges light. Using the formula P = 1/f, where P is power and f is the focal length, we find that the focal length of this lens is approximately 0.67 meters.
Explain the significance of a lens with a power of +1.5 D. What type of lens is it, and what is its focal length?
Share
A lens with a power of +1.5 D is a converging lens, typically associated with a magnifying or reading glass. The positive power indicates that the lens converges light. The focal length (f) can be calculated using the formula f = 1/P, where P is the power of the lens. In this case, f = 1/1.5, giving a focal length of approximately 0.67 meters or 67 cm. Such a lens is used to bring parallel rays of light together, making it valuable for tasks requiring magnification, like reading or detailed work at a close distance.