A) 251.2 m/s
B) 261/2 m/s
C) 271.2 m/s
D) 241/2 m/s
Correct Answer: A
Solution :
Angular velocity of the mirror \[=2rev/s\] \[=2\times 2\pi \text{ }rad/s\] Angular velocity of the reflected ray \[=2\times 4\pi \] \[=8\pi \text{ }rad/s\] Velocity of light spot over the screen \[v=r\omega \] \[=10\times 8\pi \] \[=80\pi \] \[=251.2\text{ }m/s\]You need to login to perform this action.
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