A combination of two lenses with power 1D and 2D is there. The total power is ____D.

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Detailed Solution

Concept: The total power would be 3D.
Let's first learn a bit about lenses. A lens is a transparent object that is structured to bend light rays when they pass through it in a particular way, whether that means making the rays converge at a given point or diverge as if from that point.
The combined focal length of two lenses is infinite when their separation (d) is equal to the sum of their separate focal lengths (f1 + f2) . The light rays that were refracted are now parallel to one another. The first lens produces an image that is used as the subject of the second lens when two lenses are joined.
The ratio of the height of the final picture to the height of the item determines the magnification of a mixture.
A lens's power lies in its ability to converge or diverge the light ray that strikes it. A lens's ability to converge or diverge a parallel light beam is quite strong when it has a short focal length.
The diopter (D) is a unit of measurement for electricity, and one diopter equals one meter of focal length for a lens. Two focal length lenses are an example. When two small lenses with P1 and P2 powers are coupled, the resulting power is: