How is it possible for a convex lens to form a real image?
a)exiting light rays refract toward the normal and intersect at the focal point
b) light rays refract and travel parallel to the principal axis
c) exiting light rays travel backward and bend toward the normal
d) light rays travel though the focal point on the way to the lens

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change? work power gravitational energy chemical energy

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.