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A convave lens of focal length 15cm forms an image 10 cm from the lens.How far is the object placed from the lens ? Show the ray diagram 
Asked by ihsanansar123 | 27 Feb, 2018, 04:15: PM
answered-by-expert Expert Answer
begin mathsize 12px style 1 over f equals 1 over v minus 1 over u f space equals space f o c a l space l e n g t h space left parenthesis n e g a t i v e space f o r space c o n c a v e space l e n s right parenthesis space equals space minus 15 space c m v space equals space i m a g e space t o space l e n s space d i s tan c e space equals space minus 10 space space fraction numerator 1 over denominator negative 15 end fraction space equals space fraction numerator 1 over denominator negative 10 end fraction minus 1 over u space semicolon space s o l v i n g space t h i s space w e space g e t space u space equals negative 30 space c m end style
 
Hence lens-to-object distance is 30 cm on same side of image
Answered by Thiyagarajan K | 27 Feb, 2018, 06:47: PM

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