Question

how are dioptre and focal length of a lens related to each another
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Answer 1

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Answer:

Explanation:

SO, FIRST WHAT IS DIOPTRE :

Dioprtre is used to measure the power of a lens.

It is represented by D. .

FOCAL LENGTH:

It is the distance between the principal focus and the pole of the spherical mirror. It is denoted by f.

And,

$\large\red{\boxed{Dioptre =\dfrac{1}{f}}}$

where f is the focal length.