Resistor is connected in parallel witl a 4.0 resistor. these resistors are connected to a battery. w out, i. e, becomes an infinite resistance? ttery. itt happen if the 3. tti happen if resistor burns a) the current in the 4.0 resistor will drop to zero. b) the power dissipated in the circuit will increase g the current provided by the battery will not change d) the current in the 6.0 resistor will increase.

what is the actual question though?

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.