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Q.

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


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a

1           

b

2           

c

3           

d

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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