Piaget's basic test for object permanence involves

seeing how babies play with their mothers.
showing a baby an interesting toy and then covering it with a cloth.
placing a toe in a baby's hand and seeing how the baby responds to it.
seeing if a baby can imitate a facial expression it has been shown.

showing a baby an interesting toy and then covering it with a cloth.

Psychology

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When the lens of the eye focuses light on the retina, the result is a(n):

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