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Lenses with a focal length of $1 meter$ have a diopter strength of :

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1

2

3

4

answer is A.

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Detailed Solution

Lenses with a focal length of

1 meter

have a diopter strength of

1

.
Dioptre strength refers to the optical power of a lens and lenses with a focal length of

1 m

have a dioptre strength of

1

. Since the strength of the dioptre is based on the inverse ratio of the focal length,

2 dioptre

lens is not

2 m

but

1 / 2 m

, and

3 dioptre

lens is

1 / 3 m

and so forth.

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