If the focal length of a convex lens is 50cm, which one of the following is its power?

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Q: 60 (NDA-II/2018)
If the focal length of a convex lens is 50cm, which one of the following is its power?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,5,4,5,1,2,1

keywords: 

{'focal length': [1, 0, 5, 7], 'convex lens': [0, 0, 0, 4], 'dioptre': [0, 0, 0, 5], 'power': [24, 3, 21, 61]}