Question
What is power of a lens?
Answer
The power of the lens is the reciprocal of the focal length of the lens.
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VSA : What is power of a lens?
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State whether true or false: (i) A convex mirror is used as a driver’s mirror. (ii) The absolute refractive index of a medium can be less than unity. (iii) A band of seven colours of white light is called the spectrum. (iv) In a photographic camera, a concave lens is used. (v) To correct long-sightedness a concave lens of suitable focal length is used.
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