what is meant by power of lens? write the SI unit? A student uses a lens of focal length 40 cm and another if -20 cm . Write the nature and power of each lens?
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The reciprocal of focal length is defined as the power of a lens. Its SI unit is Dioptre which is shown by capital D . hence, mirror used in this case is converging in nature
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If a lens has a shorter focal length it is said to be more powerful. The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). Diverging (concave ) lenses have negative focal lengths, so they also have negative power values
Power of lense = 1/ focal length in meter. The lense used is a convex lens because the focal length is a positive value. The lense used is a concave lens because the focal length is a negative value.
Explanation:
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