Two lenses, the first with focal length -12.5 cm and the second with focal length 20.0 cm, are separated by 15.0 cm. If an object is place 50.0 cm in front of the first lens, where is the final image formed?
A. 10.0 cm before the first lens
B. 25.0 cm before the second lens
C. 25.0 cm after the second lens
D. 50.0 cm after the second lens
E. 100 cm after the second lens
E. 100 cm after the second lens
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A 4.0 cm high object is 20. cm in front of a 1.333 Diopter plano-convex lens
(a) Find the image position. Real or Virtual? (b) Find the image size. Erect or Inverted?
When an atom absorbs energy, it becomes excited.
Answer the following statement true (T) or false (F)
Answer the following statement(s) true (T) or false (F)
1. We can consider a set of all chlorine atoms in a block of salt (sodium chloride) to be a “system.” 2. We can consider that set to be an “extended object.” 3. Consider a three-particle system. The center of mass of this system must lie on the plane that contains all three particles. T or F? Be prepared to explain why or why not. 4. In the situation discussed in problem C4T.10, which would be the easiest reasonably valid frame to use? 5. A reference frame attached to a train is a reasonably good inertial frame if the train is stopped at a station.
How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?
What will be an ideal response?