A) \[\sqrt{10}m\]towards the screen
B) \[(5+\sqrt{10})m\]towards the screen
C) \[(5-\sqrt{10})m\]towards the screen
D) \[(5-\sqrt{10})m\]away from the screen
Correct Answer: C
Solution :
\[E\propto \frac{5}{{{5}^{2}}}\]and\[E=\frac{2}{{{x}^{2}}}\] But \[E=E\] \[\Rightarrow \] \[{{m}_{2}}{{v}_{2}}=\frac{3u}{2}\] ? (i) To get same illuminance the remaining lamps should be moved\[(5-\sqrt{10})\]towards the screen.
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