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ICSE Class 10 Answered

A convex lens of focal length 24 cm produces a real image at 60 cm.find the distance of object from the lens  
Asked by pranav1727chaudhari | 02 Sep, 2019, 11:35: AM
answered-by-expert Expert Answer
We have lens equation :-  (1/v) - (1/u) = (1/f )
 
where v is lens-to-image distance, u is lens-to-object distance and f is focal length.
 
u is negative by sign convention.
 
Hence (1/u) = (1/f) - (1/v) = (1/24) - (1/60)  = 1/40  
 
hence u = 40 cm
Answered by Thiyagarajan K | 02 Sep, 2019, 01:02: PM

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