Which digits in a measurement are always significant? Check all that apply. zeros to the left of the decimal point
zeros between nonzero numbers
zeros to the right of the decimal point
nonzero numbers
zeros to the right of both the decimal point and a nonzero number
O zeros to the left of both the decimal point and a nonzero number

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.