Focal Length of Lens
The corrective lens has a good focal length. The converging lens has a positive focal length. Thus, the converging lens that the doctor has recommended will correct vision problems.
- The focal length of a mirror (or lens) is the separation between its pole and focal point. It can also be measured as the distance between its optical center and pole.
- The point at which a parallel beam of light is "focused" after reflection in the mirror is known as the focal point (F) of a mirror.
- For a convex lens and convex mirror, the focal length is assumed to be positive.
- For a concave lens and a concave mirror, it is regarded negatively.
- It is denoted by f. Here, PF = f
Therefore, the patient's prescription corrective lens has a focal length of +0.67m. The doctor has recommended a converging lens as a corrective lens.
A doctor has prescribed a corrective lens of power +1.5D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
A +1.5D power corrective lens has been recommended by a doctor. The lens has a 0.67 m focal length. The converging lens that is being prescribed. In a converging lens, the focal length is positive.
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