Piaget theorized there are four times when equilibration, inadequate schemes are reorganized or replaced with more advanced and mature schemes, occurs during development. these stages are called:

These stages are called: Piaget's four stages of intellectual (or cognitive) development . They are : a) Sensorimotor. Birth through ages 18-24 months. b) Preoperational. Toddlerhood (18-24 months) through early childhood (age 7) c) Concrete operational. Ages 7 to 12. and d) Formal operational. Adolescence through adulthood.

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to figure the total magnification of an image that you are viewing through the microscope is really quite simple. to get the total magnification take the power of the objective (4x, 10x, 40x) and multiply by the power of the eyepiece, (usually 10x)