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ICSE Class 10 Answered

The power of a lens is +2.0Dfind its focal length and state the kind of a lens
 
Asked by Surya | 18 Jun, 2017, 08:48: AM
answered-by-expert 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 | 01 Nov, 2017, 12:50: PM
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