The power of a lens is +2.0Dfind its focal length and state the kind of a lens

Asked by Surya | 18th Jun, 2017, 08:48: AM

Expert Answer:

begin mathsize 12px style Power space of space straight a space lens space is
straight P equals fraction numerator 1 over denominator straight f left parenthesis in space straight m right parenthesis end fraction equals plus 2.0 space straight D
therefore straight f equals 1 half equals plus 0.5 space straight m equals plus 50 space cm
Hence comma space the space focal space length space of space the space lens space is space 50 space cm.
Positive space sign space of space the space focal space length space indicates space that space it space is space straight a space convex space lens. end style

Answered by Romal Bhansali | 1st Nov, 2017, 12:50: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.