Question

Define one dioptre?(1mark)

Answer 1

one dioptre is the power of a lens whose focal length is 1 metre.

Hope it helps
Thanks...

Answer 2

Answer:

$hello \: buddy \:$

Explanation:

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

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