20) C
first two are in series = 0.5 uF
now consider the parallel = 0.5 + 1 = 1.5
Now, we have 1.5 and 1 in series
c= 0.6 uF
21) C
c di = do f / (do - f) = 8*10/(8-10) = -40 cm; m = -di/do = -40/8 = -5
22) B
n1 sini = n2 sinr (Simply use Snell's law)
23) d
Kirchhof's law => Sum of currents entering a point = sum of currents leaving
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