MCQ
While using an electric bulb, the reflection for street lighting should be from
- AConcave mirror
- ✓Convex mirror
- CCylindrical mirror
- DParabolic mirror
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(Given, mean kinetic energy of a molecule (at $T$ ) is $4 \times 10^{-14}$ erg, $g=980\, cm / s ^{2}$, density of mercury $=13.6\, g / cm ^{3}$)