The following three impedances are connected in series across a 100V, 2kHz supply: (i) a
resistance of 100, (ii) a coil of inductance 0.45mH and 20 resistance, and (iii) a 30
resistor in series with a 10uF capacitor. Calculate
a) the circuit current,
b) the circuit phase angle and
c) the voltage drop across each impedance.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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friction

explanation:

they us to move forward and backwards