The compound microscope is made from two lenses. Which statement is true concerning the operation of the compound microscope? a. Both lenses form real images
b. Both lenses form virtual images.
c. The lens closest to the object forms a virtual image; the other lens forms a real image.
d. The lens closest to the object forms a real image; the other lens forms a virtual image.

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.