Incident ray x passes parallel to the principal axis of a concave lens. incident ray y passes parallel to the principal axis of a convex lens. how do the rays behave differently after passing through each lens? ray x continues moving in the same direction, and ray y refracts and passes through the focal point located behind the lens. both rays refract and move as though they passed through the focal point. ray x appears as though it passed through the focal point in front of the lens, and ray y passes through the focal point on the other side of the lens. both rays continue moving in the same directio

What are the phases shown in a and d called?

Why do electron microscopes have higher resolving power than light microscopes?

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.