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6. The convex lens of a copy machine has a focal length of 0.25m. A
letter to be copied is placed 0.4m from the lens. How far from the lens,
di, is the paper?

By sj wilson · 2005 ·  related articlesschool violence prevention programs fell into four broad categories: universal interferes with their efforts to teach. program for children attending any grade, pre-k through 12th 

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.