Question

What is the power of lens? What are the two uses of a concave mirror?

Answer 1

A concave mirror, or convergingmirror, has a reflecting surface that bulges inward (away from the incident light). Concave mirrors reflect light inward to one focal point.They are used to focus light.

Answer 2

The power of a lens is its ability to bend light – the greater the power the greater the refraction of light. The power of a lens is also related to the focal length by the following formula: Power of a lens is measured in Dioptres (D).

They are also used to provide a magnified image of the face for applying make-up or shaving. ... Concave mirrors are used to form optical cavities, which are important in laser construction.

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