A) \[\frac{{{l}_{1}}}{2}\]
B) \[2{{l}_{1}}\]
C) \[{{l}_{1}}\sqrt{2}\]
D) \[{{l}_{1}}\sqrt{3}\]
Correct Answer: D
Solution :
Let OW be the wall. From \[\Delta \,AOW,\,\,\,x={{l}_{1}}\,\cos {{30}^{o}}=\frac{\sqrt{3}{{l}_{1}}}{2}\] From \[\Delta \,BOW,\] \[x={{l}_{2}}\,\cos \,{{60}^{o}}=\frac{{{l}_{2}}}{2}\] \[\therefore \] \[\frac{{{l}_{2}}}{2}=\frac{\sqrt{3}}{2}{{l}_{1}}\] or \[{{l}_{2}}=\sqrt{3}\,{{l}_{1}}\]You need to login to perform this action.
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