15. Which is the basic physics of the anti-reflection coating technology? (A) Double-slit interference. (B) Total internal reflection. (C) The Michelson interference. (D) The thin-film interference.

4. A point-like bug of mass m lies on the rim of a uniform disk of mass M that can rotate freely about its center. Initially the bug and disk rotate together with an angular velocity ω₀. Then the bug walks half way to the center of the disk. What is ratio of the new kinetic energy of the system to its initial kinetic energy? (A) (4m+2M)/(m+2M) (B) (m+2M)/(4m+2M) (C) (2m+4M)/(2m+M) (D) (2m+M)/(2m+4M)

15. Which is the basic physics of the anti-reflection coating technology?
(A) Double-slit interference.
(B) Total internal reflection.
(C) The Michelson interference.
(D) The thin-film interference.

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