MCQ
Convergence of concave mirror can be decreased by dipping in
- AWater
- BOil
- CBoth
- ✓None of these
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Reason $(R):$ The laws of reflection are strictly valid for plane surfaces but not for large spherical surfaces.

$e=100$ $sin$ $20t$
$i=20sin$ $\left( {30t - \frac{\pi }{4}} \right)$
In one cycle of $A.C.$, the average power consumed by the circuit and the wattless current are, respectively