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An image is formed by a convergent lens when the object is placed between lens and focus.Will the focal length be negative or positive.?Explain

Asked by SAYON 17th March 2017, 5:41 PM
Answered by Expert


On basis of New Cartesian Sign Convention, the focal length of a convex lens is considered to be positive and that of a concave lens is considered to be negative. 

Answered by Expert 17th March 2017, 6:04 PM
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