Physics 6. power of a lens is expressed in diopters (D). You have probably seen

Question

Physics

6. power of a lens is expressed in diopters (D). You have probably seen this used in eyeglass prescriptions where converging lenses (reading glasses) are prescribed in positive diopers and diverging lenses (correc- tion for near-sightedness) are prescribed using negative diopt The power, in diopters, is obtained by taking the inverse of the focal length, after the length converted to meters. The power of two or adjacent lenses is simply the sum of their individual powers. more 1123) Find the combined power of three close-up lenses for a camera that are raled tID, and +3D. What +2D, is the focal length of each lens? What is the focal length of the stack of three lenses? nnd a virtual image?

Explanation / Answer

The total power, as said, is the sum:

Dtot = 1D + 2D + 3D

Dtot = 6D   [ANSWER]

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The focal length is the inverse of the power. Thus, the focal lengths are

1/D, 1/(2D), 1/(3D), respectively. [ANSWER]

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