Suppose a ray of light traveling in a material with an index of refraction n a reaches an interface with a material having an index of refraction n b . Which of the following statements must be true for total internal reflection to occur?

Check all that apply. A. The angle of incidence must be less than the critical angle. B. na = nbC. na > nbD. The angle of incidence must be greater than the critical angle. E. The angle of incidence must be equal to the critical angle.

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

If the textbook weighs 19.6 newtons on venus,what is the strength of gravity on venus?

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.