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प्रश्न
The SI unit of focal length of a concave lens is ______.
पर्याय
meter
-metre
dioptre
metre per second
MCQ
रिकाम्या जागा भरा
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उत्तर
The SI unit of focal length of a concave lens is meter.
Explanation:
Focal length is a distance, and the SI unit of length/distance is always the metre, irrespective of whether the lens is concave or convex.
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