Acandle is placed 40cm in front of a convex mirror with a focal length of 20cm, as shown on the diagram. what is the distance from the lens to the image?

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

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