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in this activity we will demonstrate how a glass filled with water can act as a convex lens for this activity we need glass paper with the arrow drawn on it pointing right and water keep the glass in front of the arrow we see the Arrow Through the Glass pointing towards our right now fill the glass with water we observe that the arrow has magically turned its direction and now it is pointing towards a left move the glass closer to the arrow we observe that Arrow now again points towards our right why does this happen this inversion of image depends on the distance between the object and the lens in this case the glass with water which acts as a lens when the object lies between the focal length of the lens and its optical center the image it forms is erect and not laterally inverted hence the arrow points in a proper direction that is towards our right however when the object lies beyond the focal length of the lens the image becomes inverted and hence the arrow turns its direction and