Which statement about lens power and focal length is correct?

Question

Which statement about lens power and focal length is correct? — Exam MCQ

rrbjepyq.in · Accepted Answer

B. Power is inversely proportional to focal length — P = 1/f when focal length is measured in metres.

rrbjepyq.in · Answer

A. Power is inversely proportional to the square of focal length

rrbjepyq.in · Answer

C. Power is proportional to the square of focal length

rrbjepyq.in · Answer

D. Power is directly proportional to focal length