The object distance for a concave lens is 8.0 cm, and the image distance is 12.0 cm. the height of the object is 4.0 cm. what is the height of the image?

0.50 cm
2.7 cm
18 cm
6.0 cm

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct