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CBSE Class 10 Answered

Given ,            h=5 , f=12, u=8cm,v=?          By lens formula
Asked by panchalrajveer96 | 21 Oct, 2018, 07:26: AM
Expert Answer
we assume lens to be used is convex lens so that focal length is +ve by sign convention

lens formula is : - 1/f = 1/v - 1/u
 
where f is focal length, v is lens to image distance, u is lens to object distsance. By sign convention u, i.e., object distance is negative.
 
hence 1/12 = 1/v + 1/8     or 1/v = 1/12 - 1/8 , we get v = -24 cm , 
 
By sign convention if the image distance is negative, then both object and image are left side , i.e, image is magnified, erect and virtual
Answered by Thiyagarajan K | 26 Oct, 2018, 08:55: AM

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