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I have one screenshot where there is some calculation..can anyone tell me how is that guy getting those decimal numbers..the number is like 1.000*248Then 1.803*248Then 0.634*248Then 0.928*248Then 3.992*248Can anyone tell me how these decimal number are coming..

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Answer:

A DOCTOR PRESCRIBES a CONNECTIVE lene of power + 0,25D to a person. The focal length of LENS and the type is A. +4m & CONVEX lens B. - 2m and convex lens C.+4m and concave lens D.- 4m and concave lens



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