The circuit shown in the figure is used to provide regulated (5 V) across the 1 resistor. Assume that the Zener diode has a constant reverse breakdown voltage for a current range, starting from a minimum required Zener current,  to its maximum allowable current. The input voltage  may vary by 5% from its nomial value of 6 V. The resistance of the diode in the breakdown region is negligible.

The value of R and the minimum required power dissipation rating of the diode, respectively, are