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Refraction through a Lens — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsRefraction through a Lens1 Mark
Question
Define the term power of a lens. In what unit is it expressed?
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Answer

The power of a lens is a measure of deviation produced by it in the path of rays refracted through it.
Its unit is Dioptre (D).

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