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CBSE Class 10 Answered

 2 converging lens are placed together with focal lengths 15cm and 30cm respectively. Calculate the total power?
Asked by varakalasuchi3 | 26 Feb, 2018, 07:39: PM
answered-by-expert Expert Answer
combined focal length F of two lenses of focal lengths f1 and f2 is given by
begin mathsize 12px style 1 over F space equals space fraction numerator 1 over denominator f 1 end fraction plus fraction numerator 1 over denominator f 2 end fraction semicolon F space equals space fraction numerator f 1 cross times f 2 over denominator f 1 plus f 2 end fraction space i f space f 1 space equals space 15 space c m space a n d space f 2 space equals space 30 space c m comma space t h e n space w e space g e t space F equals 10 space c m. end style
 
Hence power = 100/10 = +10D
Answered by Thiyagarajan K | 26 Feb, 2018, 08:52: PM
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