Question

find the effective power of the combination of two lenses in contact having powers (1) +5D and +3D (2) +5D and -3D

Answer 1

Answer on Question #43371- Physics-Optics

Find the effective power of the combination of two lenses in contact having powers (1) +5D and +3D (2) +5D and -3D

Solution

The effective power of the combination of two lenses in contact having powers $D_{1}$ and $D_{2}$ is

$$D_{eff} = D_{1} + D_{2}.$$

(1) $D_{eff} = +5\mathrm{D} + (+3\mathrm{D}) = +8\mathrm{D}$.

(2) $D_{eff} = +5\mathrm{D} + (-3\mathrm{D}) = +2\mathrm{D}$.

Answer: (1) +8D; (2) +2D.