What is meant by power of a lens? Give its SI Units. When two or more lenses are placed in
contact, what will be their combine power
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The power of a lens is defined as the ability of the lens to converge or diverge the incident ray of light on it. Its SI unit is dioptre and the combined power of two or more lenses in contact is the sum of their individual powers.
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Answer:
power of lens means the inverse of focal length. SI unit is DIOPTER. add the power of both lenses for getting the combined power of lenses
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