Question

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?​

Answer 1

Answer:

image distance = 40cm. Since the image formed is the same size, real andinverted, the object is placed at 2F1. The image so formed in 2F2. Hence object distance = 40cm.

Explanation:

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Answer 2

Image distance= 40 cm

since , image is real , inverted and same as the object

object is at 2F1

image is formed at 2F2

hence distance = 40