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ICSE Class 10 Answered

How is the focal length of a lens affected by change in(1) radii of curvature of two surfaces of lens (2)refractive index of the material of lens?
Asked by Kanwaranita10 | 07 Aug, 2019, 05:41: PM
answered-by-expert Expert Answer
A c c o r d i n g space t o space l e n s space m a k e r apostrophe s space f o r m u l a space fraction numerator space 1 over denominator f end fraction equals open parentheses mu minus 1 close parentheses open parentheses 1 over R subscript 1 minus fraction numerator begin display style 1 end style over denominator begin display style R subscript 2 end style end fraction close parentheses F o c a l space l e n g t h space i s space i n v e r s l y space p r o p o r t i o n a l space t o space r e f r a c t i v e space i n d e x space o f space t h e space l e n s comma space g r e a t e r space t h e space r e f r a c t i v e space i n d e x space s m a l l e r space w i l l space b e space t h e space f o c a l space l e n g t h. F o c a l space l e n g t h space i s space d i r e c t l y space p r o p o r t i o n a l space t o space r a d i u s space o f space c u r v a t u r e.
Answered by Utkarsh Lokhande | 07 Aug, 2019, 06:27: PM

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How is the focal length of a lens affected by change in(1) radii of curvature of two surfaces of lens (2)refractive index of the material of lens?
Asked by Kanwaranita10 | 07 Aug, 2019, 05:41: PM
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