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6 A water proof laser pointer of length 10 cm placed in a water tank...

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6 A water proof laser pointer of length 10 cm placed in a water tank rotates about a horizontal axis passing through its center of mass in a vertical plane as shown in the figure The time period of rotation is 60 s Assuming the water to be still and no reflections from the surface of the tank the duration for which the light beam escapes the tank in one time period is close to Refractive index of water 1 33 40 cm a 8 13 s c 16 27 s 30 cm Laser 10 cm 30 cm b 14 05 s d 23 86 s

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