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infinity
placing an object at F of a positive lens will put the image at ______
F’
if object is at infinity, image is formed at ___ for a positive lens
F’
for a minus lens, if an object is at infinity, its virtual image will be formed at ___
infinity
if an object is placed at F of a negative lens, image forms at ____
2F’
if an object is put at 2F for a converging lens, image is at __