Consider a flat slab made of negative-index material that is placed in air. Assume that a point source is located at the origin of the x-axis, the thickness of the slab is d, and the point source is d/4 away from the first interface of the slab.

(1) If the refractive index n=-1, sketch the light rays to show that two focal points can be formed due to negative refraction. Determine the coordinates of the two focal points by using Snell's law, ray optics and trigonometry.
(2) If the refractive index of the slab is changed to n=-2 while the other conditions are kept the same, can such a slab still form an ideal, point image?

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared. 

Hellosubatomic particles  are  particles  that are smaller than the atom. protons, neutrons, and electrons are the three mainsubatomic particles  found in an atom. protons have a positive (+)  charge. an easy way to remember this is to remember that both neutron and no  electrical charge  start with the letter "n."have a nice day