Which statement is true of light when it speeds up on entering another medium
a) the index of refraction is higher in the second medium that it was in the first
b) the index of refraction is lower in the second medium than it was in the first
c) the speed of light though the medium is close to the speed of light in a vacuum
d) the angel of incidence equals the angle of refraction in this instance

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?