Acd has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. if the laser is at a position 3.7 cm from the center of the disk, what are the revolutions per minute (rpms) of the disk?

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.