Question

Doctor advised to use 1D lens . What is its focal length ?​

Answer 1

Explanation:

So, the focal length of the lens is 100 cm

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Answer 2

Answer:

The focal length is 1 cm

Explanation:

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Refer the attachment .

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NOTE :

Definition of 1 D : A dioptre (1 D) is defined as the power of a lens whose focal length is 1 m.