A converging lens has a focal length of 10 cm. A 10-cm pencil is placed at such a distance from the lens that an image of 15 cm is formed. What is the magnification of the lens at this location?

An atom that has fewer electrons that protons is called a positive ion.

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.