The lens
Question
The plane faces of two identical plano-convex lenses each having focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is
Moderate
Solution
To obtain, an inverted and equal size image, object must be paced at a distance of 2f from lens, i.e. 40 cm in this case
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