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Question
The SI unit of focal length of a concave lens is ______.
Options
meter
-metre
dioptre
metre per second
MCQ
Fill in the Blanks
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Solution
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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