The image of an object formed by a lens is real, inverted and of the same size as the object. If the image is at a distance of 40 cm from the lens, what is the focal length of the lens?
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1
Explanation:
image distance = 40cm. Since the image formed is the same size, real and inverted, the object is placed at 2F1. The image so formed in 2F2. Hence object distance = 40cm
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Image distance= 40 cm
since , image is real , inverted and same as the object
object is at 2F1
image is formed at 2F2
hence distace = 40
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