Question

define 1 dioptre at least in 20 word​

Answer 1

dioptre is the units of power of lense

dioptre can also be written ad m^-1

1dioptre=1/(focal length)

1dioptre=1/(focal length in metres)

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Answer 2

$1dioptre \: is \: power \: of \: lens \: \\ whose \: focal \: length \: is \: 1cm \: \\ \\ 1d= \frac{1}{1m}$

$hope \: my \: answer \: helps \: you$