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प्रश्न
When is the power of a lens negative?
अति संक्षिप्त उत्तर
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उत्तर
The power of a lens is negative when the lens is a concave (diverging) lens. Its focal length is negative.
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पाठ 4: Refraction of Light - EXERCISE-3 [पृष्ठ ९९]
