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One dioptre (1 D) is defined as the power of a lens whose focal length is

Question
One dioptre (1 D) is defined as the power of a lens whose focal length is
1 centimetre
1 metre
100 metres
1 millimetre
Answer
1 metre
Detailed Explanation
The chapter states that 1 dioptre is the power of a lens whose focal length is 1 metre (1 D = 1 m^-1).
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