Question

Explain power of lenses in contact.​

Answer 1

Answer:

The power of a lens is measured as the reciprocal of the focal length of the lens. Relation with focal length: A lens of less focal length produces more converging or diverging and is said to have more power.

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Answer 2

Answer:

The reciprocal of focal length is the power of the lens.

Explanation:

What is the power of lenses?

• The power of the lens is equal to the reciprocal of focal length. It is measured in a unit called dioptre.
• The power of a concave lens is negative.
• The power of a convex lens is positive.
• Myopia or nearsightedness is corrected using a concave lens. Thus, the power of glasses for myopia is given in negative.
• Hypermetropia or longsightedness is corrected using a convex lens. Thus, the power of glasses for myopia is given in positive.